Hi @armindopereira,
In that case, from my point of view, that is a feature of your payment method and not a Magento feature.
In the past I did something like that for a Payment Gateway here in Argentina. It was with Magento 1 but the idea works. I created a new payment method (in my case, available only for backend) and the email sent to the user includes the button.
Then, the user, from the email, click on the button, is redirected to the Payment Gateway page, and pay. Finally, the customer is redirected to the Success page into the store.
That's what you're looking for, right?
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