# PayPal NVP API (/api/nvp-soap/nvp)



> **Note:** **Deprecation notice**: PayPal's NVP APIs are legacy APIs, but PayPal continues to support them. To access the most current features and security:
>
> * For new integrations, [start with the latest tools](/).
>
> * For existing integrations, [visit the upgrade hub](/upgrade/).

The [Name-Value Pair (NVP) API](/api/nvp-soap/) provides parameter-based association between the request and response fields of a message and their values. The request message is sent from your website by the API, and a response message is returned by PayPal using a client-server model in which your site is a client of the PayPal server. NVP describes the format of the request and response messages that you send to and receive from the PayPal API. An example of a name-value pair is `<FieldName>=<Value>`, where `<FieldName>` is the name of the PayPal API field and `<Value>` is the information that you pass to or receive from the PayPal API, such as, `VERSION=200`.