Cancellation Service The ics_paypal_update_agreement service cancels a billing agreement. When you request ics_paypal_update_agreement, you must include the following fields in the request: ■ ics_applications ■ merchant_id ■ merchant_ref_number ■ paypal_billing_agreement_id ■ paypal_billing_agreement_status Additional fields are optional. The required and optional fields are described in Appendix A, API Fields.