curl --request POST \
  --url http://{host}:{port}/{contextPath}/migration/execute \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "migrationPlan": {
    "sourceProcessDefinitionId": "aProcessDefinitionId1",
    "targetProcessDefinitionId": "aProcessDefinitionId2",
    "instructions": [
      {
        "sourceActivityIds": [
          "aUserTask"
        ],
        "targetActivityIds": [
          "aUserTask"
        ]
      },
      {
        "sourceActivityIds": [
          "anEvent"
        ],
        "targetActivityIds": [
          "anotherEvent"
        ],
        "updateEventTrigger": true
      }
    ],
    "variables": {
      "foo": {
        "type": "Object",
        "value": "[5,9]",
        "valueInfo": {
          "objectTypeName": "java.util.ArrayList",
          "serializationDataFormat": "application/json"
        }
      }
    }
  },
  "processInstanceIds": [
    "aProcessInstance",
    "anotherProcessInstance"
  ],
  "processInstanceQuery": {
    "processDefinitionId": "aProcessDefinitionId1"
  },
  "skipCustomListeners": true
}
'

import requests

url = "http://{host}:{port}/{contextPath}/migration/execute"

payload = {
    "migrationPlan": {
        "sourceProcessDefinitionId": "aProcessDefinitionId1",
        "targetProcessDefinitionId": "aProcessDefinitionId2",
        "instructions": [
            {
                "sourceActivityIds": ["aUserTask"],
                "targetActivityIds": ["aUserTask"]
            },
            {
                "sourceActivityIds": ["anEvent"],
                "targetActivityIds": ["anotherEvent"],
                "updateEventTrigger": True
            }
        ],
        "variables": { "foo": {
                "type": "Object",
                "value": "[5,9]",
                "valueInfo": {
                    "objectTypeName": "java.util.ArrayList",
                    "serializationDataFormat": "application/json"
                }
            } }
    },
    "processInstanceIds": ["aProcessInstance", "anotherProcessInstance"],
    "processInstanceQuery": { "processDefinitionId": "aProcessDefinitionId1" },
    "skipCustomListeners": True
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    migrationPlan: {
      sourceProcessDefinitionId: 'aProcessDefinitionId1',
      targetProcessDefinitionId: 'aProcessDefinitionId2',
      instructions: [
        {sourceActivityIds: ['aUserTask'], targetActivityIds: ['aUserTask']},
        {
          sourceActivityIds: ['anEvent'],
          targetActivityIds: ['anotherEvent'],
          updateEventTrigger: true
        }
      ],
      variables: {
        foo: {
          type: 'Object',
          value: '[5,9]',
          valueInfo: {
            objectTypeName: 'java.util.ArrayList',
            serializationDataFormat: 'application/json'
          }
        }
      }
    },
    processInstanceIds: ['aProcessInstance', 'anotherProcessInstance'],
    processInstanceQuery: {processDefinitionId: 'aProcessDefinitionId1'},
    skipCustomListeners: true
  })
};

fetch('http://{host}:{port}/{contextPath}/migration/execute', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "62437",
  CURLOPT_URL => "http://{host}:{port}/{contextPath}/migration/execute",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'migrationPlan' => [
        'sourceProcessDefinitionId' => 'aProcessDefinitionId1',
        'targetProcessDefinitionId' => 'aProcessDefinitionId2',
        'instructions' => [
                [
                                'sourceActivityIds' => [
                                                                'aUserTask'
                                ],
                                'targetActivityIds' => [
                                                                'aUserTask'
                                ]
                ],
                [
                                'sourceActivityIds' => [
                                                                'anEvent'
                                ],
                                'targetActivityIds' => [
                                                                'anotherEvent'
                                ],
                                'updateEventTrigger' => true
                ]
        ],
        'variables' => [
                'foo' => [
                                'type' => 'Object',
                                'value' => '[5,9]',
                                'valueInfo' => [
                                                                'objectTypeName' => 'java.util.ArrayList',
                                                                'serializationDataFormat' => 'application/json'
                                ]
                ]
        ]
    ],
    'processInstanceIds' => [
        'aProcessInstance',
        'anotherProcessInstance'
    ],
    'processInstanceQuery' => [
        'processDefinitionId' => 'aProcessDefinitionId1'
    ],
    'skipCustomListeners' => true
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "http://{host}:{port}/{contextPath}/migration/execute"

	payload := strings.NewReader("{\n  \"migrationPlan\": {\n    \"sourceProcessDefinitionId\": \"aProcessDefinitionId1\",\n    \"targetProcessDefinitionId\": \"aProcessDefinitionId2\",\n    \"instructions\": [\n      {\n        \"sourceActivityIds\": [\n          \"aUserTask\"\n        ],\n        \"targetActivityIds\": [\n          \"aUserTask\"\n        ]\n      },\n      {\n        \"sourceActivityIds\": [\n          \"anEvent\"\n        ],\n        \"targetActivityIds\": [\n          \"anotherEvent\"\n        ],\n        \"updateEventTrigger\": true\n      }\n    ],\n    \"variables\": {\n      \"foo\": {\n        \"type\": \"Object\",\n        \"value\": \"[5,9]\",\n        \"valueInfo\": {\n          \"objectTypeName\": \"java.util.ArrayList\",\n          \"serializationDataFormat\": \"application/json\"\n        }\n      }\n    }\n  },\n  \"processInstanceIds\": [\n    \"aProcessInstance\",\n    \"anotherProcessInstance\"\n  ],\n  \"processInstanceQuery\": {\n    \"processDefinitionId\": \"aProcessDefinitionId1\"\n  },\n  \"skipCustomListeners\": true\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Basic <encoded-value>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("http://{host}:{port}/{contextPath}/migration/execute")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"migrationPlan\": {\n    \"sourceProcessDefinitionId\": \"aProcessDefinitionId1\",\n    \"targetProcessDefinitionId\": \"aProcessDefinitionId2\",\n    \"instructions\": [\n      {\n        \"sourceActivityIds\": [\n          \"aUserTask\"\n        ],\n        \"targetActivityIds\": [\n          \"aUserTask\"\n        ]\n      },\n      {\n        \"sourceActivityIds\": [\n          \"anEvent\"\n        ],\n        \"targetActivityIds\": [\n          \"anotherEvent\"\n        ],\n        \"updateEventTrigger\": true\n      }\n    ],\n    \"variables\": {\n      \"foo\": {\n        \"type\": \"Object\",\n        \"value\": \"[5,9]\",\n        \"valueInfo\": {\n          \"objectTypeName\": \"java.util.ArrayList\",\n          \"serializationDataFormat\": \"application/json\"\n        }\n      }\n    }\n  },\n  \"processInstanceIds\": [\n    \"aProcessInstance\",\n    \"anotherProcessInstance\"\n  ],\n  \"processInstanceQuery\": {\n    \"processDefinitionId\": \"aProcessDefinitionId1\"\n  },\n  \"skipCustomListeners\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("http://{host}:{port}/{contextPath}/migration/execute")

http = Net::HTTP.new(url.host, url.port)

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"migrationPlan\": {\n    \"sourceProcessDefinitionId\": \"aProcessDefinitionId1\",\n    \"targetProcessDefinitionId\": \"aProcessDefinitionId2\",\n    \"instructions\": [\n      {\n        \"sourceActivityIds\": [\n          \"aUserTask\"\n        ],\n        \"targetActivityIds\": [\n          \"aUserTask\"\n        ]\n      },\n      {\n        \"sourceActivityIds\": [\n          \"anEvent\"\n        ],\n        \"targetActivityIds\": [\n          \"anotherEvent\"\n        ],\n        \"updateEventTrigger\": true\n      }\n    ],\n    \"variables\": {\n      \"foo\": {\n        \"type\": \"Object\",\n        \"value\": \"[5,9]\",\n        \"valueInfo\": {\n          \"objectTypeName\": \"java.util.ArrayList\",\n          \"serializationDataFormat\": \"application/json\"\n        }\n      }\n    }\n  },\n  \"processInstanceIds\": [\n    \"aProcessInstance\",\n    \"anotherProcessInstance\"\n  ],\n  \"processInstanceQuery\": {\n    \"processDefinitionId\": \"aProcessDefinitionId1\"\n  },\n  \"skipCustomListeners\": true\n}"

response = http.request(request)
puts response.read_body

{
  "type": "<string>",
  "message": "<string>",
  "code": 123
}