That's good, but I would personally suggest marketing the new product to the customer as if you worked for Paymate themselves.
For example, We have now begun accepting Paymate for your shopping convenience.
With this new option, your transaction is processed faster, meaning you get your item shipped faster, avoiding any unwanted frustrating delays.
Of course Paymate's world class security measures also ensures you with peace of mind about the safety of your transaction.
The idea is to make the customer feel that you are providing the service for them, not so much for yourself, you can use your own phrasing, just keep the message context : )