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delphiDll / Salesforce Platform APIs / Publish multiple events

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var
http: HCkHttp;
success: Boolean;
json: HCkJsonObject;
resp: HCkHttpResponse;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

http := CkHttp_Create();

// Use this online tool to generate code from sample JSON: Generate Code to Create JSON

// The following JSON is sent in the request body.

// {
//   "allOrNone": true,
//   "compositeRequest": [
//     {
//       "method": "POST",
//       "url": "/services/data/v{{version}}/sobjects/Carbon_Comparison__e",
//       "referenceId": "event1",
//       "body": {
//         "Annual_Mileage__c": 12000,
//         "Current_Vehicle__c": "Fast car 1",
//         "Model_Year__c": 2019
//       }
//     },
//     {
//       "method": "POST",
//       "url": "/services/data/v{{version}}/sobjects/Carbon_Comparison__e",
//       "referenceId": "event2",
//       "body": {
//         "Annual_Mileage__c": 12000,
//         "Current_Vehicle__c": "Fast car 2",
//         "Model_Year__c": 2019
//       }
//     }
//   ]
// }

json := CkJsonObject_Create();
CkJsonObject_UpdateBool(json,'allOrNone',True);
CkJsonObject_UpdateString(json,'compositeRequest[0].method','POST');
CkJsonObject_UpdateString(json,'compositeRequest[0].url','/services/data/v{{version}}/sobjects/Carbon_Comparison__e');
CkJsonObject_UpdateString(json,'compositeRequest[0].referenceId','event1');
CkJsonObject_UpdateInt(json,'compositeRequest[0].body.Annual_Mileage__c',12000);
CkJsonObject_UpdateString(json,'compositeRequest[0].body.Current_Vehicle__c','Fast car 1');
CkJsonObject_UpdateInt(json,'compositeRequest[0].body.Model_Year__c',2019);
CkJsonObject_UpdateString(json,'compositeRequest[1].method','POST');
CkJsonObject_UpdateString(json,'compositeRequest[1].url','/services/data/v{{version}}/sobjects/Carbon_Comparison__e');
CkJsonObject_UpdateString(json,'compositeRequest[1].referenceId','event2');
CkJsonObject_UpdateInt(json,'compositeRequest[1].body.Annual_Mileage__c',12000);
CkJsonObject_UpdateString(json,'compositeRequest[1].body.Current_Vehicle__c','Fast car 2');
CkJsonObject_UpdateInt(json,'compositeRequest[1].body.Model_Year__c',2019);

// Adds the "Authorization: Bearer <access_token>" header.
CkHttp_putAuthToken(http,'<access_token>');

resp := CkHttp_PostJson3(http,'https://domain.com/services/data/v{{version}}/composite/','application/json',json);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add(IntToStr(CkHttpResponse_getStatusCode(resp)));
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));
CkHttpResponse_Dispose(resp);

CkHttp_Dispose(http);
CkJsonObject_Dispose(json);

Curl Command

curl -X POST
	-H "Authorization: Bearer <access_token>"
	-d '{
    "allOrNone": true,
    "compositeRequest": [
        {
            "method": "POST",
            "url": "/services/data/v{{version}}/sobjects/Carbon_Comparison__e",
            "referenceId": "event1",
            "body": {
                "Annual_Mileage__c": 12000,
                "Current_Vehicle__c": "Fast car 1",
                "Model_Year__c": 2019
            }
        },
        {
            "method": "POST",
            "url": "/services/data/v{{version}}/sobjects/Carbon_Comparison__e",
            "referenceId": "event2",
            "body": {
                "Annual_Mileage__c": 12000,
                "Current_Vehicle__c": "Fast car 2",
                "Model_Year__c": 2019
            }
        }
    ]
}'
https://domain.com/services/data/v{{version}}/composite/

Postman Collection Item JSON

{
  "name": "Publish multiple events",
  "request": {
    "method": "POST",
    "header": [
    ],
    "body": {
      "mode": "raw",
      "raw": "{\n    \"allOrNone\": true,\n    \"compositeRequest\": [\n        {\n            \"method\": \"POST\",\n            \"url\": \"/services/data/v{{version}}/sobjects/Carbon_Comparison__e\",\n            \"referenceId\": \"event1\",\n            \"body\": {\n                \"Annual_Mileage__c\": 12000,\n                \"Current_Vehicle__c\": \"Fast car 1\",\n                \"Model_Year__c\": 2019\n            }\n        },\n        {\n            \"method\": \"POST\",\n            \"url\": \"/services/data/v{{version}}/sobjects/Carbon_Comparison__e\",\n            \"referenceId\": \"event2\",\n            \"body\": {\n                \"Annual_Mileage__c\": 12000,\n                \"Current_Vehicle__c\": \"Fast car 2\",\n                \"Model_Year__c\": 2019\n            }\n        }\n    ]\n}",
      "options": {
        "raw": {
          "language": "json"
        }
      }
    },
    "url": {
      "raw": "{{_endpoint}}/services/data/v{{version}}/composite/",
      "host": [
        "{{_endpoint}}"
      ],
      "path": [
        "services",
        "data",
        "v{{version}}",
        "composite",
        ""
      ]
    }
  },
  "response": [
  ]
}