In Settings > Retail > Integrations, you'll see a list of possible payment methods. Toggle Enable next to each method to control which ones are available to your online store's customers.

Use the "=" symbols under the Display Order column to drag and drop payment methods into the order you would like them listed on your website.

Tip: If your store is on WooCommerce, you can automatically sync payment method settings by clicking Sync with WooCommerce in the upper right corner.