purchase_insurance(access_token='token_abc123', insurance_type='comprehensive', booking_id='insurance_12345', insurance_cost=1500.0, card_id='card_4893')
retrieve_invoice(access_token='token_abc123', booking_id='insurance_12345')
contact_customer_support(booking_id='insurance_12345', message='There are discrepancies in my travel-related costs. Please assist.')
ticket_login(username='mthompson', password='SecurePass123')
create_ticket(priority=4, title='Discrepancy in Travel Costs', description='Feedback from customer support was unsatisfactory regarding discrepancies in travel costs.')