# PMS API The Experience CRM relies on being synchronized with the hotel PMS. We send communications to guests before their arrival, during their stay, and after. **Thus, it is essential to keep the CRM up to date with cancellations, new reservations and modifications**. The optimal scenario is to be updated after each change, whether it is a booking change, or a customer property change (like a new last name, or new phone number for example). To summarize, what is expected from partners on this API are: * Complete booking data after each of these booking events : Creation, Modification, Change of status(valid/option/cancelled) * Complete customer information after each customer data change. * Provide historical bookings data for the property. ### Certification This API require a Certification by the Experience Technical Partnership Team before using. You can email to get Development Access to test the API before the certification. #### Available in this API: {% content-ref url="/pages/W2KTqoaliCMnw2o0tSUf" %} [Create and update bookings](/experience-crm-api/reservations/pms-api/create-and-update-bookings.md) {% endcontent-ref %} {% content-ref url="/pages/G49CRPHSafPF29krAwym" %} [Update existing customers](/experience-crm-api/reservations/pms-api/update-existing-customers.md) {% endcontent-ref %} {% content-ref url="/pages/t6wQ9xhi9lHsK22huWMX" %} [2 way](/experience-crm-api/reservations/pms-api/2-way.md) {% endcontent-ref %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://experience-crm.gitbook.io/experience-crm-api/reservations/pms-api.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.