register_credit_card(access_token='abc123xyz456', card_number='1432-7890-6543-9876', expiration_date='12/2025', card_verification_number=321, cardholder_name='Michael Thompson')
purchase_insurance(access_token='abc123xyz456', insurance_type='comprehensive', insurance_cost=2000.0, booking_id='insurance_12345',card_id='262919693687')
retrieve_invoice(access_token='abc123xyz456', booking_id='insurance_12345')
contact_customer_support(booking_id='insurance_12345', message='Unexpected hiccup during travel. Please prioritize our case for immediate attention.')