In order to prevent overbookings, the OTA can call this function when starting the booking process to verify if for a specific listing and dates there is availability at that moment.

Endpoint: https://ws.icnea.net/availability_verification.aspx 

<availability_verification>
  <link>
    <user>character(20)</user>
    <password>character(20)</password>
  </link>
  <lodging>
    <lodging_id>integer(8)</lodging_id>
    <date_from>yyyy-mm-dd (iso8601)</date_from>
    <date_to>yyyy-mm-dd (iso8601)</date_to>
  </lodging>
</availability_verification>

Response:

<availability_verification_response>
  <available>true/false</available>
</availability_verification_response>