A counterparty links a party to your merchant with a relationship type.
Try in API Reference: Create · List · Retrieve · Update
Relationship types
When to use
Required for POST /v1/invoices/create and POST /v1/orders/create in the document-first flow. Not required when using POST /v1/checkouts/create with payer details.
Create
party_id is optional in the API if Dollr can resolve the party another way — for document-first flows, always pass party_id from party create.
List
Optional filters: fullname, relationship_type.
Retrieve
Returns the counterparty with embedded party details.
Update
Last modified on June 23, 2026