In order to accept payments you need to create a payment gateway for your store. Unless you choose a manual gateway you need to first install the relevant module for your chosen payment provider (PayPal, Stripe, Braintree etc.).
After you've installed the module(s) go to /admin/commerce/config/payment-gateways to create and configure your payment gateway(s).
Click 'Add payment gateway', choose your provider from the plugin list and complete the form fields that appears below.
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