patch
https://staging-api.365finance.co.uk/applications//cancelapplication
Cancels an active application on behalf of a merchant. The application must belong to the authenticated partner. Sets the application status to 'Closed - Declined by merchant' with status detail 'Partner Declined'.
Guard conditions: Returns 409 Conflict if the application is already in a terminal state (funded, declined, or previously closed).
Bad request - brokerId query parameter is missing
Unauthorized - Missing or invalid API key
Forbidden - Invalid or deactivated API key
Application not found for this partner
Internal server error