register_credit_card(access_token='abc123xyz', card_number='4012888888881881', expiration_date='12/2028', card_verification_number=465, cardholder_name='Michael Smith')
purchase_insurance(access_token='abc123xyz', insurance_type='comprehensive', booking_id='flight_001', insurance_cost=200.0, card_id='262919693687')
retrieve_invoice(access_token='abc123xyz', booking_id='flight_001')
contact_customer_support(booking_id='flight_001', message='Insurance-related issues that need resolution')
ticket_login(username='msmith', password='SecurePass123')
create_ticket(priority=4, title='Unsatisfactory Customer Support', description='')
cancel_booking(access_token='abc123xyz', booking_id='flight_001')