For Profit Platform sites with a shop, we recommend using the Stripe service to manage payment processing. It's easy and free to sign up for a Stripe account. Once you have an active Stripe account, you can connect it to your Profit Platform shop in the WooCommerce module by pasting four code keys from your Stripe dashboard.
The page inside your WordPress dashboard where you configure Stripe connection settings is at:
WooCommerce > Settings > Payments > Stripe (One Click Upsells)
Be sure to paste the API keys in the correct blanks. Putting the keys in the wrong spots will cause your checkout process to malfunction.
Also, keep your API keys secret. Do not share them except by pasting them from Stripe into the correct spots on your website.
For further details, just watch the video below: