How to assign payment system

You can add Paypal or Stripe payment systems to your site,
You can connect a payment system in the Site Settings → Payment Systems tab. Also you can add a «Cash on delivery» option here.
If you have connected one payment system, the buyer will be redirected to the connected payment system after successful form submitting and then he will be able to pay.

If you have connected two or more payment systems , there will be a payment method choose in the shopping cart.
You can change a payment method name in the settings of that payment method in the Site Settings → Payment Systems.
If you want to use Cash on delivery option, connect that payment method in Site Settings → Payment Systems
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