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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