Update vendor (partial)

Update specific fields on a vendor. Send only the fields you want to change — anything you don't send stays as it is. To clear a nullable field, send null.

Example — rename a vendor and update its TIN:

{"name": "Acme Supply Co.", "tin": "12-3456789", "tin_type": "ein"}

Example — change payment routing:

{"bank_account_number": "000123456789", "bank_routing_number": "021000021"}

Existing attachments are preserved unless you explicitly send the attachments field; use the dedicated attachments endpoint to manage them.

Custom fields

Set custom fields by name:

{"custom_fields": [{"Partner": true}, {"Tier": "Gold"}]}

Each item is a one-key object where the key is the custom field's name and the value is whatever you want to set. Use null to clear a field. If the name doesn't match a custom field in your organization you'll get a 422 back — we won't silently ignore it. If you happen to have two custom fields with the same name, use the id-based shape:

{"custom_fields": [{"field": {"id": 42}, "value": {"custom_field_id": 42, "value": "Acme"}}]}

Omitting custom_fields from the request leaves existing values untouched.