Offer a managed dispute service that reconstructs the transaction, gathers the required documents, identifies the responsible merchant, and prepares or submits refund and chargeback claims with the traveler. Begin with a fixed-fee evidence review and a success-based recovery package, supported by human case management and reusable templates for each booking channel and card issuer. The service should handle payment disputes, not general travel complaints or legal representation.

The signals span Booking.com, Accor, Expedia, and Hotels.com and repeatedly describe double charges, withheld refunds, broken support channels, and extensive evidence requests. The fragmentation between platforms, properties, installment providers, and card issuers creates a recurring coordination problem that a focused service can address.