"The PayPal Merchant SDK provides the following:SetExpressCheckout API Operation (NVP/SOAP): The SetExpressCheckout API operation initiates an Express Checkout transaction.DoDirectPayment API Operation (NVP/SOAP): The DoDirectPayment API Operation enables you to process a credit card payment.MassPay API Operation (NVP/SOAP): The MassPay API operation makes a payment to one or more PayPal account holders.GetRecurringPaymentsProfileDetails API Operation (NVP/SOAP): Obtain information about a recurring payments profile.ManageRecurringPaymentsProfileStatus API Operation (NVP/SOAP): The ManageRecurringPaymentsProfileStatus API operation cancels, suspends, or reactivates a recurring payments profile.UpdateRecurringPaymentsProfile API Operation (NVP/SOAP): The UpdateRecurringPaymentsProfile API operation updates a recurring payments profile.DoReferenceTransaction API Operation (NVP/SOAP): The DoReferenceTransaction API operation processes a payment from a buyer’s account, which is identified by a previous transaction."
PayPalMerchantSDK
Library or NuGet package built with .net standard and c# by PayPal.
Project website: https://github.com/paypal/merchant-sdk-dotnet
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