How can we implement credit card transactions in Yii?
Your question is not that detailed of what you have tried or you are asking about API or something. What i can say is
Stripe has a PHP library to accept credit cards without needing a merchant account.
If you need something quick and dirty, you can just use PayPal's "Buy" buttons and drop them on your pages. These will take people off-site to PayPal where they can pay with a PayPal account or a credit card. This is free and super easy to implement.
If you want something a bit nicer where people pay on-site with their credit card, then you would want to look into one of those 3rd part payment providers.
Basic procedure is something like PayPal works like
You may use any number of payment gateways with Yii Framework, PayPal, Authorize.net, etc. You simply need to sign up for a merchant account with one of these payment gateway providers and the corresponding API should give you details on how to perform the transaction.
There is no "Yii specific" payment gateway integration. Remember, Yii is just a PHP framework. Anything that works with PHP works in Yii.
There are millions of payments gateways, pick one, read their documentation on implement that solution.
来源：https://stackoverflow.com/questions/13269455/credit-card-transactions-in-yii