Update all the values of custom data for a dispatch by ref

API for updating the custom data of an existing dispatch:

HTTP Status Code Summary
| Code | Description |
| --- | ---- |
| 200 - OK | Everything worked as expected. |
| 400 - Bad Request | The request was unacceptable, often due to missing a required parameter. |
| 401 - Unauthorized | No valid API key provided. |
| 404 - Not Found | The requested resource doesn't exist. |

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