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...
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A .NET implementation for the Coinbase API for online payments. The Coinbase API is a way to seamlessly pay for goods or services online utilizing Coinbase and Bitcoins for low-cost payment processing.
A .NET implementation of the Coinbase Commerce API for cryptocurrency payments. Coinbase Commerce is the easiest and safest way for a business to start accepting digital currency payments. Works with Bitcoin (BTC), Ethereum (ETH), Litecoin (LTC), and Bitcoin Cash (BCH)!
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...
More information
A .NET implementation for the Dwolla Checkout (off-site gateway) API for online payments. The Off-Site Gateway API is a way to seamlessly pay for goods or services online utilizing Dwolla's low-cost payment processing platform.