Here’s how:
Log in to the Shopify admin panel.
Click Settings.
Click Payments.
Under the PayPal module, click the Activate PayPal link.
Click on Deactivate
Click on Deactivate confirmation.
Click Activate PayPal Express Checkout.
Log in to your PayPal account. Make sure that the email address matches the primary email address on the merchant’s account.
Click Agree and Connect.
Click on Go back to Shopify to return to Shopify admin panel.
Under Payment Capture Method, select one:
Automatically at checkout (Authorize and Capture Payment)
Automatically capture payments for orders (Immediate Sale).
Manually capture payment for orders (Authorize only).
Click Save.
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