Abstract: The present disclosure provides systems and methods for providing a transaction service when a service provider is providing a travel service to a service requester according to a travel service order through an online to offline service platform. The method may include receiving, through the online to offline service platform, a first request for the transaction service from a first terminal associated with the service requester, when a service provider is providing the travel service to the service requester. The method may include determining whether a condition for the transaction service is satisfied. In response to determining that the condition is satisfied, the method may also include generating a transaction service order for the transaction service. The method may further include providing the transaction service according to the transaction service order by using an account of the service provider.