contact_update_unsupported - PayPathIQ API

Field	Value
Status	`409`
Problem `type`	`https://docs.paypathiq.com/problems/contact_update_unsupported`
Retryable	No

When this happens

The request changes a Customer’s contacts, but at least one existing or submitted Contact has no externalContactId. PayPathIQ can only match Contacts by their external ID, so it cannot tell which Contact to update.

What to do

Send an externalContactId on every Contact. Contacts that were created without one cannot be changed; repeat them unchanged or omit contacts. See Updating Contacts.