put
https://api.preczn.com/v1/forms//primary-location
Form-scoped equivalent of the primaryLocationId field on PATCH /v1/merchants/:merchantId. { "primaryLocationId": "<id>" } designates a location of the form's merchant as primary (404 if the id is not one of its locations); { "primaryLocationId": null } clears the designation. The key must be present — an empty body is a 400, not a clear.
Validation failure, or the form has expired ({ expirationUrl }).
Form, merchant, or location not found.