API: sort transactions by payment date

When you want to list transactions in our API, you had 2 listing choices: based on the transaction date or the transaction status update. We have just added the ability to filter the transaction list based on the payment date of the transaction.

When a network provides the information in its API, we check if the transaction is paid by the advertiser during the status update, the information is available in our API and you can now for example list the latest paid transactions bu using the parameter time_type=paid.