You can use Stripe to accept online payment with credit cards.
All you need to do is purchase the Stripe extension (for the web and for your APP) in our marketplace and do some fast configurations in your editor.
1. Go to the Admin Area>Integration section.
2. Paste the keys of the Stripe Account, if you want to test then put the sandbox keys.
Write the Keys that Stripe provides you here: https://dashboard.stripe.com/account/apikeys
And that's all, now you can accept credit cards on your Website/App.
Glad we can help
Have a nice day!
Regards, Pol Zepeda