{
  "resourceType": "StructureDefinition",
  "url": "https://example.org/fhir/StructureDefinition/MyExtension",
  "name": "MyExtension",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "complex-type",
  "abstract": false,
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "Method of refund",
        "definition": "Metoda refundacji",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "https://example.org/fhir/StructureDefinition/MyExtension"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Wartosc refundacji",
        "min": 1,
        "type": [
          {
            "code": "string"
          }
        ]
      }
    ]
  }
}