I am going to be creating a payment gateway for a client and was just wondering what information I need from him? I have build gateways in the past but it was a long time ago and all I can remember I need is an API key. What other info is required for me to get from my client? Please note that I dont know who the gateway is through yet. I am just looking for standard info I will need. THANKS!
For starters your would need to know, who is the Payment gateway provider, such as Paypal, Moneybookers or ..... and from that you would need to know their documentation.
You're going to need bank account information to attach to your payment gateway eventually. It really depends what processor you're using.
Thank you for the responses We will be using authorize.net through WordPress. Already approved by the bank, what info do I need?
You should use some sort of e-commerce processor for Wordpress, which already has Authorize.net built in: http://getshopped.org/ - Authorize.net comes bundled http://www.woothemes.com/extensions/woocommerce-extensions/ - This is Paid version for Woocommerce. But if you want to integrate Authorize.net directly to your wordpress without any extra plugins, then only way is to hire someone, who would do the module.
If I remember correctly Authorize.net offers an API called AIM that allows you to handle credit card processing by POSTing data. It's relatively easy to use and there should be Libraries out there made IN PHP and also Perl.