Disclosed are various approaches for dynamically integrating a client application with multiple third-party services. An integration service receives a request to perform an action relative to a particular third-party service from a client device. The request is received through a first application programming interface (API) generic to a plurality of third-party services. The integration service communicates with the particular third-party service to perform the action using a second API specific to the particular third-party service. The integration service sends a response to the client device through the first API. The response is based at least in part on a result of the action and includes an indication of one of a plurality of predefined user interfaces.