PayPal offers classic APIs, such as Express Checkout, Mass Payments, Invoicing, and Button Manager, as well as REST APIs, Payflow APIs, and Braintree APIs. Where can I find more information about PayPal APIs and SDKs? Instead of having to write an API call and convert the parameters into a format that the API expects, a programmer can use an SDK, which has language-specific methods to do this. If this token isn't used, the API won't work and will return a failure.Ī Software Development Kit (SDK) is a pre-built set of functions that are language-specific (for example, PHP, ASP or Ruby) and do a lot of the heavy lifting for you. For instance, a SetExpressCheckout response includes a token that should be used in DoExpressCheckoutPayment. Sometimes an API request expects information from another API request. The API must send a call to DoExpressCheckoutPayment to complete the payment.Īn API request often fails because an API didn't get the expected information, such as the correct total, or the shipping data when a shipping address is requested elsewhere.However, the transaction is only set up it's not complete yet.
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