Example of inquiry:

<conditions>
  <trp_destination>14_152</trp_destination>
   (...)

14 - Greece
152 - Thessaloniki

You can ask the service with more then a region, separated by comma.

<conditions>
  <trp_destination>14_152,14_2627</trp_destination>
   (...)

for the inquiry trp_destination the sign “:” means any amount of arbitrary characters example: request for all offers (all regions) for a country with id 15 (Spain)

<conditions>
<trp_destination>15:</trp_destination>
...
</conditions>

Since version 2.3 returns in filters

The list of countries, regions, and their IDs can be obtained by utilizing inquiry filters via the trp_destination field.