post https://api.olxgroup.com/oauth/v1/token
"grant_type": "authorization_code"
This request is related to RE user context, so you, as a partner, will get authorization (or not) to manage the inventory of a RE user account. Authorization process should be done once.
Basic Base64 and api_key are that data you have received from the Support Team or directly from the Developer Center.
code is a temporary password during the user authorization that you need to use to exchange it per token (you have 1 minutes to do it). Please take a look at our documentation for more details.
As a response, you will receive an access_token and a refresh_token to manage user inventory, message, and business information.