Members of the company's active memberships holding the given notification type, with the payment-origin flags of their setting.

For payer_email_copy: the members that receive a BCC copy of the emails sent to the payers — pay_by_bank for payer-initiated payments, created_by_me / created_by_others for payments created from the Console. Returns an empty list when nobody opted in.

🔒 External clients call this endpoint with an OAC (Organisation Access Credentials — ⚠️ Beta) access token carrying the companies:read and users:read scopes.