PayPal’s NVP API makes it simple to integrate PayPal payments into your specific web application. You, the merchant, construct an NVP string and post it via HTTPS (HTTP Secure, aka TLS/SSL) to the PayPal authorization server. PayPal posts back an NVP- formatted response that you then parse in your web application for the information relevant to the payment. Figure 1-1 shows a basic request an…