PayPal Checkout uses the REST API and is the integration PayPal maintains going forward. Payments Standard is the legacy email-based (IPN) flow: quicker to set up, but no automatic recurring billing, local payment methods or card-only option.
PayPal Checkout
1
Open the PayPal Developer Dashboard
Sign in at developer.paypal.com with your PayPal Business account.
2
Switch the toggle to Live
Not Sandbox. Sandbox credentials cannot take real money.
3
Create an app
Go to Apps & Credentials, click Create App, name it (SellAuth works), and choose the Merchant type.
4
Copy the Client ID and Secret
Paste both into the matching fields on the SellAuth payment method page.
5
Enter the account email and save
Use the PayPal email of the same Business account you created the app under.
PayPal Checkout options
Only Card Payments restricts the PayPal checkout page to cards, hiding the PayPal account option. Useful when you want PayPal purely as a card processor. Enable Shipping Inputs asks the buyer for a shipping address during PayPal checkout. Turn it on if you sell physical goods and want PayPal’s address on the transaction record.PayPal Payments Standard
Enter your PayPal email in PayPal E-mail and save. That is the whole setup. Payments are confirmed through IPN, and subscriptions on this method renew by e-mail invoice rather than automatic charge.Fees and limits
All shared method settings apply. PayPal also supports currency override, which bills the invoice in a currency you choose rather than your shop currency. Use it when your PayPal account settles in a specific currency.Troubleshooting
Payments fail after the settings saved without errors. The credentials are sandbox, or the app belongs to a different account than the email. Create App is missing in the developer dashboard. The account is not a Business account. Upgrade it in PayPal or use Payments Standard instead. Local payment methods never appear. They are available on PayPal Checkout only, and PayPal decides which to show based on the buyer’s country and the transaction currency.Next steps
PayPal Friends & Family
The F&F variant, its risks, and IPN setup.
Refunds and chargebacks
Recording a PayPal refund and responding to a dispute.