Well, these days I had to refuse a site and application proposal, since they needed me to have a payment method for the application / site where it should be approved instantly so that the request was already delivered. I was working with the pagseguro using transparent checkout, however he Confirm payment on :
Credit Card - within 2 business days after payment, and can be extend
And searching a bit more, I saw the mercadopago , which for credit card says to be instant approval. I wonder if there is another alternative for instant payment