Stripe

You can use Stripe to accept online payment with credit cards.

1. Go to the Admin Area > Settings section and open the Stripe Settings.

2. Paste the keys of the Stripe Account, if you want to test then put the sandbox keys.

3. And the live version.

Write the Keys that Stripe provides you here: https://dashboard.stripe.com/account/apikeys

4. For the final step, you need to go to your business and enable this payment method.

And that's all, now you can accept credit cards on your Website/App.