Introduction to PayPal Express Checkout : PayPal Express Checkout Flows

PayPal Express Checkout Flows
PayPal offers two Express Checkout customer experience flows.
Traditional Express Checkout Flow
When your customer is ready to pay for the products selected from your web site:
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The customer clicks Checkout with PayPal on your checkout page or clicks PayPal on your payment page.
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The redirection URL controls the customer experience. For more information, see Redirection URLs.
In-Context Express Checkout Flow
When your customer is ready to pay for the products selected from your web site:
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The customer clicks Checkout with PayPal on your checkout page or clicks PayPal on your payment page.
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For In-Context Express Checkout, follow the instructions:
https://developer.paypal.com/docs/classic/express-checkout/in-context/integration/#basic-integration.
https://developer.paypal.com/docs/classic/express-checkout/in-context/integration/#advanced-settings.
The redirection URL controls the customer experience flow. For more information, see Redirection URLs.