How to implement credit card payment in android application

I have android application. I want to accept payments in this application for some services. But unfortunately I can't find solution how to provide credit card(VISA, Master Card, etc.) payment inside android app.

I need some guidance on payment gateways

I've never done anything with payment gateways, can anybody give me suggestions?

Send post request without form with redirct in PHP [closed]

I try to connect Amex payment gateway. Here I want to submit post request to amex server and redirect to that page. I make request data from database and user inputs. Now i have request data. I use zend framework. How i send it as post request to amex server with redirect that page? Please help me.