What happens to existing contracts if I activate another payment service provider?
If you switch from one payment service provider to another for a specific mean of payment this has no effect on your customers' existing contracts. All contracts created before the change continue to be processed via the payment service provider active at the time the contract was created. If a consisted customer changes the mean of payment for a subscription, the payment will from this point onward be processed via the new payment service provider. All newly created contracts are immediately processed via the new provider.