You can subscribe monthly credits to your account in Saasuma Stack. In order to do that, follow the instructions below:
Go to your 'account settings' and then use the subscription slider to choose the amount of credits you would like to be added to your account each month.
Once you select the amount click on the 'Buy' button below. If you have previously added a payment method the purchase will process. In case you haven't added a payment method before, you will get a pop up where you can add it and then process the purchase.
The credits will come to your account balance each month.