In order to start the subscription, a payment method or eMandates first has to be used. This enables automated payment with a recurring payment method later on. With the introduction of IncludeTransaction, it is now possible to create the first invoice on the day that the first payment was received, and to switch the payment status of the first invoice to ‘paid’ based on this payment. When the IncludeTransaction is changed to ‘True’, the Payment Engine will not only match the first invoice, but also the possible follow-up invoices with this first payment. For further information, go to CreateCombinedSubscription call in the development portal.