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        #include <C_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
void ChilkatSample(void)
    {
    HCkHttp http;
    BOOL success;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.
    http = CkHttp_Create();
    req = CkHttpRequest_Create();
    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putPath(req,"/public/v1/documents/{{document_id}}/attachments/");
    CkHttpRequest_putContentType(req,"multipart/form-data");
    success = CkHttpRequest_AddFileForUpload2(req,"file"," path to file","application/octet-stream");
    CkHttpRequest_AddHeader(req,"Authorization","API-Key {{api_key}}");
    CkHttpRequest_AddHeader(req,"Expect","100-continue");
    resp = CkHttpResponse_Create();
    success = CkHttp_HttpSReq(http,"api.pandadoc.com",443,TRUE,req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        return;
    }
    printf("%d\n",CkHttpResponse_getStatusCode(resp));
    printf("%s\n",CkHttpResponse_bodyStr(resp));
    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkHttpResponse_Dispose(resp);
    }
        Curl Command
        curl -X POST
	-H "Authorization: Bearer {{access_token}}"
	-H "Authorization: API-Key {{api_key}}"
	--form 'file=@"/path/to/file"'
https://api.pandadoc.com/public/v1/documents/{{document_id}}/attachments/
        Postman Collection Item JSON
        {
  "name": "Create Attachment",
  "event": [
    {
      "listen": "test",
      "script": {
        "exec": [
          "var jsonData = JSON.parse(responseBody);",
          "if (jsonData.uuid !== undefined) {",
          "    postman.setEnvironmentVariable(\"attachment_id\", jsonData.uuid);",
          "}"
        ],
        "type": "text/javascript"
      }
    }
  ],
  "request": {
    "method": "POST",
    "header": [
      {
        "key": "Authorization",
        "value": "Bearer {{access_token}}",
        "type": "text",
        "disabled": true
      },
      {
        "key": "Authorization",
        "value": "API-Key {{api_key}}",
        "type": "text"
      }
    ],
    "body": {
      "mode": "formdata",
      "formdata": [
        {
          "key": "file",
          "type": "file",
          "src": [
          ]
        },
        {
          "key": "name",
          "value": "File Test Name",
          "type": "text",
          "disabled": true
        }
      ]
    },
    "url": {
      "raw": "https://api.pandadoc.com/public/v1/documents/{{document_id}}/attachments/",
      "protocol": "https",
      "host": [
        "api",
        "pandadoc",
        "com"
      ],
      "path": [
        "public",
        "v1",
        "documents",
        "{{document_id}}",
        "attachments",
        ""
      ]
    }
  },
  "response": [
  ]
}