Text copied from https://clickwp.com/article/woocommerce-paypal-sandbox/ The PayPal Sandbox is a place where you can test your shopping cart and other PayPal integrations in a realistic way, except that no money changes hands. This means you can test your PayPal processes in the Sandbox and know they will behave the same on the when you go live.…
Copied from https://pay.amazon.com/us/developer/documentation/express/201728560 Set up an Amazon Pay Sandbox test account You need to set up a test account in the Amazon Pay Sandbox so that you can test your integration. Create an Amazon Pay Sandbox test account Sign in to Seller Central at https://sellercentral.amazon.com. From the Marketplace Switcher drop-down menu in the center of the menu bar,…