Details about the record. For example: Name = "Mark", Description = "Description", ID = "263rd72c-edfc-4dc5-b72f-45104fe5ef43", externalId = "4614d72c-edfd-4dc5-b72f-45104fe5ef43".

Note: The fields/properties must be part of the schema/metadata created for the custom object (in this case, Name, Description, ID, and externalId must be schema fields). The schema and metadata can be generated using the Schema Manager APIs.

Refer to the following table to understand the behavior when you pass ID and/or External ID.

         | ID in payload? | ExternalId in payload? | Behavior | Validation |
         |----------------|------------------------|----------|------------|
         | Yes            | Yes                    | Create a record using the ID field value as provided in the payload. | ExternalId unique validation |
         | Yes            | No                     | Create a record using the ID field value as provided in the payload and set the ExternalId to null. | NA |
         | No             | Yes                    | Generate a new GUID and create a record using the ID field value with the new GUID value. | ExternalId unique validation |
         | No             | No                     | Generate a new GUID and create a record using the ID field value with the new GUID value and set the ExternalId to null. | NA |