# Supporting Calls

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Supporting calls are not needed to build the accommodation. They are used to retrieve additional information from booking.com's system.

* [OTA_HotelSearch](/connectivity/docs/ota-hotelsearch) - retrieve status about your accommodations such as "Open&Bookable" or "Autoclosed availability".
* [OTA_HotelDescriptiveInfo](/connectivity/docs/ota-hoteldescriptiveinfo) - retrieve property information
* [codegroups](/connectivity/docs/b_xml-codegroups) - retrieve an extensive list of all codes used in APIs by their code groups (OTA and Booking.com)
* [roomname](/connectivity/docs/b_xml-roomname) - retrieve an extensive list of standardized room names on booking.com in all languages.
* [citytaxcategory](/connectivity/docs/b_xml-citytaxcategory) - retrieve the possible French City Tax categories


The `OTA_HotelDescriptiveInfo` (HDI) endpoint is now under deprecation for Home providers
The `OTA_HotelDescriptiveInfo` (HDI) endpoint was deprecated for Home providers in December 2024. We will sunset this endpoint for Home providers on **December 31, 2026**. For more information on the deprecation and sunsetting timeline, see [OTA_HotelDescriptiveInfo (HDI) endpoint in Content API](/connectivity/docs/deprecation-policy/deprecation-and-sunsetting#ota_hoteldescriptiveinfo-hdi-endpoint-in-content-api-for-home-providers).

We strongly encourage Home providers to implement new modular APIs at their earliest convenience, which will enable them to retrieve relevant property information using the `GET` method.

To learn more about our new modular APIs, see our guide on [Making property onboarding easier](https://connectivity.booking.com/s/solution-article/content-api-modernisation-MCP2RH5PDI6VHN5HU3ECL2FER2TY?language=en_US).

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