Autopopulate Lookup field

Autopopulate Lookup field

When I create a new entry in a custom module (data sent through Zapier), I would like to autopopulate a lookup field with the value from Zapier.

However, I get this error message in Zapier:
Zoho CRM: Unable to create entry in module: Vingo_Ride. Error : Invalid data for the field id. Detail : expected_data_type long, parent_api_name Contact

Is there a way to bypass this?

Thank you,
Aurélien