Will my PayTo payment be processed if I have insufficient funds?
No. If you have insufficient funds at the time of the payment, it will be declined and the merchant will be notified of the missed payment.
If you know a payment is coming out that you won't have sufficient funds for, you are able to make changes in your App such as pausing the payment or linking it to another account. However it's important that you check your contractual obligations with the merchant you are paying and verify whether doing so will impact your service.