# FAQ

**Invalid Credentials and Codes**:

* **Invalid Username/Password**:
  * If the `HotelARIUpdateRQ` contains an invalid Username/Password, the partner should return an error response with `ShortText="Invalid Username or Password"`.
* **Invalid HotelCode**:
  * If the `HotelARIUpdateRQ` contains an invalid HotelCode, the partner should return an error response with `ShortText="Invalid HotelCode"`.
* **Invalid RoomTypeCode or RatePlanCode**:
  * If the `HotelARIUpdateRQ` contains an invalid RoomTypeCode or RatePlanCode, the partner should return an error response with `ShortText="Invalid Room/Rate"`.

**XML Attributes**:

* **Request and Response XML**:
  * Will always contain an attribute `xmlns="http://cgbridge.rategain.com/OTA/2012/05"` at the root element.
* **Date Format**:
  * The date format for Start and End is always `YYYY-MM-DD`.

**Partial Update**:

* **Mandatory Support**:
  * OTA must support Partial Update, which means each attribute (i.e., Availability, rates, restrictions, or inventory) should be updated by API individually.
  * Partial update is mandatory, and existing values should not be impacted; only updated values should be impacted.
  * **Example**:
    * If a hotel is managing occupancy pricing for 1 Adult, 2 Adults, 3 Adults, etc., the API should update each individual occupancy price without impacting other occupancy-based pricing.
    * If the 1 Adult price is sent for a date, the API should only update the 1 Adult price while the pricing for 2 Adults and 3 Adults should remain the same with existing values.


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