BMS API | What is the entityId when attempting to access custom field data?

Question

I am attempting to access custom field data, and I want to know what the entityId is from the below query: 

GET https://server_name/api/admin/customfields/data/{moduleId}/{entityId}/{customFieldId}

Answer

The {entityId} is the ID of the target object that you want to retrieve custom fields for. For example, if you want to get the custom fields of a ticket, the entityId would be the ticket ID.

Note: If the API returns a status code 404, it means it did not find any custom field data for this entity.