| Parameter | Details | 
|---|---|
| clientId | Your PayPal application client ID (OAuth 2 credentials) | 
| links | Simple reference object for all return HATEOAS links from PayPal | 
| paymentId | The ID of the payment returned from PayPal in order to complete payment | 
| payerId | The ID of the payer returned from PayPal in order to complete payment | 
| paypal | PayPal Node SDK reference | 
| payReq | JSON object containing payment information for transaction | 
| req | The request object from the server request | 
| res | The response object from the server request | 
| secret | Your PayPal application secret (OAuth 2 credentials) | 
These samples cover how to process a payment via PayPal, using the PayPal SDKs. These are simple request samples that outline the multi-step process for allowing this payment option.