Answer: Provided that there have been no errors or glitches on your (or payment processor’s) part, the message comes within 5 minutes in 99.99% cases.
Our website has an automated delivery system that sends the message to the customer as soon as the payment has been successfully completed. Sometimes messages get to their destination in 5 to 10 seconds after the payment. It fully depends on your preferred payment method.
Our instant delivery has one exception though. It has to do with Bitcoin payments: in case you pay with BTC, the system requires two confirmations from the Bitcoin network.