You can set up recurrent transactions through your portal or the API based on dates or the number of transactions.
Through the portal
1. Log in to your portal
2. Select Transactions > Add new
3. Fill in all the fields
4. Click Recurrent transaction
5. Select if you want to calculate your recurrent transaction by end date or by transactions
If you select recurrent type - monthly you cannot select any date after the 28th of any given month. This is because not every month has the same number of days.