WHO SMART Trust
1.1.6 - CI Build

WHO SMART Trust, published by WHO. This guide is not an authorized publication; it is the continuous build for version 1.1.6 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/WorldHealthOrganization/smart-trust/tree/VHLPayload and changes regularly. See the Directory of published versions

## Logical Model: HealthLinkPayload - JSON Profile

Draft as of 2025-02-21

JSON representation of the HealthLinkPayload logical model.

Raw json | Download

    {
      "resourceType" : "StructureDefinition",
      "id" : "HealthLinkPayload",
      "text" : {
        "status" : "extensions",
        "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: StructureDefinition HealthLinkPayload</b></p><a name=\"HealthLinkPayload\"> </a><a name=\"hcHealthLinkPayload\"> </a><a name=\"HealthLinkPayload-en-US\"> </a><table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top;\"><tr style=\"border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top\"><th style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"The logical name of the element\">Name</a></th><th style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Information about the use of the element\">Flags</a></th><th style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Minimum and Maximum # of times the element can appear in the instance\">Card.</a></th><th style=\"width: 100px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Reference to the type of the element\">Type</a></th><th style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px\" class=\"hierarchy\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Additional information about the element\">Description &amp; Constraints</a><span style=\"float: right\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Legend for this format\"><img src=\"data:image/png;base64, \" alt=\"doco\" style=\"background-color: inherit\"/></a></span></th></tr><tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white\"><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck1.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_element.gif\" alt=\".\" style=\"background-color: white; background-color: inherit\" title=\"Element\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload\" title=\"Health Link Payload (DRAFT)\n\nA Health Link URI is generated from this payload according to the algorithm documented [here](https://build.fhir.org/ig/HL7/smart-health-cards-and-links/links-specification.html#smart-health-links-sharing-application-generates-a-smart-health-link-uri)\n\n\">HealthLinkPayload</a><a name=\"HealthLinkPayload\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><span style=\"opacity: 0.5\">0</span><span style=\"opacity: 0.5\">..</span><span style=\"opacity: 0.5\">*</span></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://build.fhir.org/types.html#Base\">Base</a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Health Link Payload (DRAFT)</td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7\"><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck10.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.url\" title=\"Manifest URL for this Health Link\">url</a><a name=\"HealthLinkPayload.url\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">1..1</td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">url</td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white\"><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck10.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: white; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.key\" title=\"Decryption key for processing files returned in the manifest. 43 characters, consisting of 32 random bytes base64urlencoded.\">key</a><a name=\"HealthLinkPayload.key\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">1..1</td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Decryption key for processing files returned in the manifest. 43 characters, consisting of 32 random bytes base64urlencoded.</td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7\"><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck10.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.exp\" title=\"Optional. Number representing expiration time in Epoch seconds, as a hint to help the Health Link Receiving Application determine if this QR is stale. (Note: epoch times should be parsed into 64-bit numeric types.)\">exp</a><a name=\"HealthLinkPayload.exp\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">0..1</td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Optional. Number representing expiration time in Epoch seconds, as a hint to help the Health Link Receiving Application determine if this QR is stale. (Note: epoch times should be parsed into 64-bit numeric types.)</td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white\"><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck10.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: white; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.flag\" title=\"Optional. String created by concatenating single-character flags in alphabetical order:\n'L' indicates the Health Link is intended for long-term use and manifest content can evolve over time; \n'P' indicates the Health Link requires a Passcode to resolves; and 'U' indicates the Health Link's url resolves to a single encrypted file accessible via GET, bypassing the manifest and SHALL NOT be used in combination with P.\n&lt;/ul&gt;\n  \">flag</a><a name=\"HealthLinkPayload.flag\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">0..1</td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Optional. String created by concatenating single-character flags in alphabetical order:\n'L' indicates the Health Link is intended for long-term use and manifest content can evolve over time; \n'P' indicates the Health Link requires a Passcode to resolves; and 'U' indicates the Health Link's url resolves to a single encrypted file accessible via GET, bypassing the manifest and SHALL NOT be used in combination with P.\n&lt;/ul&gt;\n  </td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7\"><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck10.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.label\" title=\"Optional. String no longer than 80 characters that provides a short description of the data behind the Health Link.\">label</a><a name=\"HealthLinkPayload.label\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">0..1</td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Optional. String no longer than 80 characters that provides a short description of the data behind the Health Link.</td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white\"><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck10.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: white; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.v\" title=\"Optional. Integer representing the Health Links protocol version this Health Link conforms to. MAY be omitted when the default value (1) applies.\">v</a><a name=\"HealthLinkPayload.v\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">0..1</td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#string\">string</a></td><td style=\"vertical-align: top; text-align : left; background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Optional. Integer representing the Health Links protocol version this Health Link conforms to. MAY be omitted when the default value (1) applies.</td></tr>\r\n<tr style=\"border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7\"><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck00.png)\" class=\"hierarchy\"><img src=\"tbl_spacer.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin_end.png\" alt=\".\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\".\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <a href=\"StructureDefinition-HealthLinkPayload-definitions.html#HealthLinkPayload.type\" title=\"Classifying type code to distinguish different types of health links.  If not present then the Health Link is a SMART Health Link.\">type</a><a name=\"HealthLinkPayload.type\"> </a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"/><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">0..1</td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\"><a href=\"http://hl7.org/fhir/R4/datatypes.html#code\">code</a></td><td style=\"vertical-align: top; text-align : left; background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px\" class=\"hierarchy\">Classifying type code to distinguish different types of health links.  If not present then the Health Link is a SMART Health Link.</td></tr>\r\n<tr><td colspan=\"5\" class=\"hierarchy\"><br/><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Legend for this format\"><img src=\"data:image/png;base64, \" alt=\"doco\" style=\"background-color: inherit\"/> Documentation for this format</a></td></tr></table></div>"
      },
      "url" : "http://hl7.org/fhir/uv/smart-health-cards-and-links/StructureDefinition/HealthLinkPayload",
      "version" : "1.1.6",
      "name" : "HealthLinkPayload",
      "title" : "Health Link Payload (DRAFT)",
      "status" : "draft",
      "date" : "2025-02-21T10:09:05+00:00",
      "publisher" : "WHO",
      "contact" : [
        {
          "name" : "WHO",
          "telecom" : [
            {
              "system" : "url",
              "value" : "http://who.int"
            }
          ]
        }
      ],
      "description" : "Health Link Payload (DRAFT)\n\nA Health Link URI is generated from this payload according to the algorithm documented [here](https://build.fhir.org/ig/HL7/smart-health-cards-and-links/links-specification.html#smart-health-links-sharing-application-generates-a-smart-health-link-uri)\n\n",
      "jurisdiction" : [
        {
          "coding" : [
            {
              "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
              "code" : "001"
            }
          ]
        }
      ],
      "fhirVersion" : "4.0.1",
      "kind" : "logical",
      "abstract" : false,
      "type" : "http://hl7.org/fhir/uv/smart-health-cards-and-links/StructureDefinition/HealthLinkPayload",
      "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Base",
      "derivation" : "specialization",
      "snapshot" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
            "valueString" : "4.0.1"
          }
        ],
        "element" : [
          {
            "id" : "HealthLinkPayload",
            "path" : "HealthLinkPayload",
            "short" : "Health Link Payload (DRAFT)",
            "definition" : "Health Link Payload (DRAFT)\n\nA Health Link URI is generated from this payload according to the algorithm documented [here](https://build.fhir.org/ig/HL7/smart-health-cards-and-links/links-specification.html#smart-health-links-sharing-application-generates-a-smart-health-link-uri)\n\n",
            "min" : 0,
            "max" : "*",
            "base" : {
              "path" : "Base",
              "min" : 0,
              "max" : "*"
            },
            "isModifier" : false
          },
          {
            "id" : "HealthLinkPayload.url",
            "path" : "HealthLinkPayload.url",
            "short" : "url",
            "definition" : "Manifest URL for this Health Link",
            "min" : 1,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.url",
              "min" : 1,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.key",
            "path" : "HealthLinkPayload.key",
            "short" : "Decryption key for processing files returned in the manifest. 43 characters, consisting of 32 random bytes base64urlencoded.",
            "definition" : "Decryption key for processing files returned in the manifest. 43 characters, consisting of 32 random bytes base64urlencoded.",
            "min" : 1,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.key",
              "min" : 1,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.exp",
            "path" : "HealthLinkPayload.exp",
            "short" : "Optional. Number representing expiration time in Epoch seconds, as a hint to help the Health Link Receiving Application determine if this QR is stale. (Note: epoch times should be parsed into 64-bit numeric types.)",
            "definition" : "Optional. Number representing expiration time in Epoch seconds, as a hint to help the Health Link Receiving Application determine if this QR is stale. (Note: epoch times should be parsed into 64-bit numeric types.)",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.exp",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.flag",
            "path" : "HealthLinkPayload.flag",
            "short" : "Optional. String created by concatenating single-character flags in alphabetical order:\n'L' indicates the Health Link is intended for long-term use and manifest content can evolve over time; \n'P' indicates the Health Link requires a Passcode to resolves; and 'U' indicates the Health Link's url resolves to a single encrypted file accessible via GET, bypassing the manifest and SHALL NOT be used in combination with P.\n</ul>\n  ",
            "definition" : "Optional. String created by concatenating single-character flags in alphabetical order:\n'L' indicates the Health Link is intended for long-term use and manifest content can evolve over time; \n'P' indicates the Health Link requires a Passcode to resolves; and 'U' indicates the Health Link's url resolves to a single encrypted file accessible via GET, bypassing the manifest and SHALL NOT be used in combination with P.\n</ul>",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.flag",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.label",
            "path" : "HealthLinkPayload.label",
            "short" : "Optional. String no longer than 80 characters that provides a short description of the data behind the Health Link.",
            "definition" : "Optional. String no longer than 80 characters that provides a short description of the data behind the Health Link.",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.label",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.v",
            "path" : "HealthLinkPayload.v",
            "short" : "Optional. Integer representing the Health Links protocol version this Health Link conforms to. MAY be omitted when the default value (1) applies.",
            "definition" : "Optional. Integer representing the Health Links protocol version this Health Link conforms to. MAY be omitted when the default value (1) applies.",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.v",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.type",
            "path" : "HealthLinkPayload.type",
            "short" : "Classifying type code to distinguish different types of health links.  If not present then the Health Link is a SMART Health Link.",
            "definition" : "Classifying type code to distinguish different types of health links.  If not present then the Health Link is a SMART Health Link.",
            "min" : 0,
            "max" : "1",
            "base" : {
              "path" : "HealthLinkPayload.type",
              "min" : 0,
              "max" : "1"
            },
            "type" : [
              {
                "code" : "code"
              }
            ]
          }
        ]
      },
      "differential" : {
        "element" : [
          {
            "id" : "HealthLinkPayload",
            "path" : "HealthLinkPayload",
            "short" : "Health Link Payload (DRAFT)",
            "definition" : "Health Link Payload (DRAFT)\n\nA Health Link URI is generated from this payload according to the algorithm documented [here](https://build.fhir.org/ig/HL7/smart-health-cards-and-links/links-specification.html#smart-health-links-sharing-application-generates-a-smart-health-link-uri)\n\n"
          },
          {
            "id" : "HealthLinkPayload.url",
            "path" : "HealthLinkPayload.url",
            "short" : "url",
            "definition" : "Manifest URL for this Health Link",
            "min" : 1,
            "max" : "1",
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.key",
            "path" : "HealthLinkPayload.key",
            "short" : "Decryption key for processing files returned in the manifest. 43 characters, consisting of 32 random bytes base64urlencoded.",
            "definition" : "Decryption key for processing files returned in the manifest. 43 characters, consisting of 32 random bytes base64urlencoded.",
            "min" : 1,
            "max" : "1",
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.exp",
            "path" : "HealthLinkPayload.exp",
            "short" : "Optional. Number representing expiration time in Epoch seconds, as a hint to help the Health Link Receiving Application determine if this QR is stale. (Note: epoch times should be parsed into 64-bit numeric types.)",
            "definition" : "Optional. Number representing expiration time in Epoch seconds, as a hint to help the Health Link Receiving Application determine if this QR is stale. (Note: epoch times should be parsed into 64-bit numeric types.)",
            "min" : 0,
            "max" : "1",
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.flag",
            "path" : "HealthLinkPayload.flag",
            "short" : "Optional. String created by concatenating single-character flags in alphabetical order:\n'L' indicates the Health Link is intended for long-term use and manifest content can evolve over time; \n'P' indicates the Health Link requires a Passcode to resolves; and 'U' indicates the Health Link's url resolves to a single encrypted file accessible via GET, bypassing the manifest and SHALL NOT be used in combination with P.\n</ul>\n  ",
            "definition" : "Optional. String created by concatenating single-character flags in alphabetical order:\n'L' indicates the Health Link is intended for long-term use and manifest content can evolve over time; \n'P' indicates the Health Link requires a Passcode to resolves; and 'U' indicates the Health Link's url resolves to a single encrypted file accessible via GET, bypassing the manifest and SHALL NOT be used in combination with P.\n</ul>\n  ",
            "min" : 0,
            "max" : "1",
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.label",
            "path" : "HealthLinkPayload.label",
            "short" : "Optional. String no longer than 80 characters that provides a short description of the data behind the Health Link.",
            "definition" : "Optional. String no longer than 80 characters that provides a short description of the data behind the Health Link.",
            "min" : 0,
            "max" : "1",
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.v",
            "path" : "HealthLinkPayload.v",
            "short" : "Optional. Integer representing the Health Links protocol version this Health Link conforms to. MAY be omitted when the default value (1) applies.",
            "definition" : "Optional. Integer representing the Health Links protocol version this Health Link conforms to. MAY be omitted when the default value (1) applies.",
            "min" : 0,
            "max" : "1",
            "type" : [
              {
                "code" : "string"
              }
            ]
          },
          {
            "id" : "HealthLinkPayload.type",
            "path" : "HealthLinkPayload.type",
            "short" : "Classifying type code to distinguish different types of health links.  If not present then the Health Link is a SMART Health Link.",
            "definition" : "Classifying type code to distinguish different types of health links.  If not present then the Health Link is a SMART Health Link.",
            "min" : 0,
            "max" : "1",
            "type" : [
              {
                "code" : "code"
              }
            ]
          }
        ]
      }
    }