If you will have your accounts receivable in Younium and keep track of payments, you would want to add payment methods for bookings and accounting. Normally there is a structure for this in your accounting system. Consider distinguishing Younium payments from other payments by setting up a specific payment method and bank account to separate you subscription payments from other payments received.
Go to Settings>> Account Receivables >>>Payment Methods
Then press ADD
Name your method and give it a Description, then add the Financial Account for payments, the Exchange Rate Gains and Losses, and Bank Fee accounts. If this will be your default payment method, hit the Default checkbox.
Press SAVE.