Install the REST SDK

To begin working with the PayPal REST APIs, install one of the available SDKs in your preferred language. The benefit of using an SDK over a direct integration is, the SDK handles authentication for you by obtaining your OAuth 2 access token and the SDK automatically reflects any payment API updates.

To install the PayPal REST SDK, type this command in a Terminal window or a command prompt:

npm install paypal-rest-sdk
// Prerequisites: PHP 5.3 or above
// cURL, json & openssl extensions must be enabled

composer require "paypal/rest-api-sdk-php:*"
// System library dependancies: libssl-dev, libffi-dev

// Debian systems
apt-get install libssl-dev libffi-dev

// easy_install method
easy_install paypalrestsdk

// pip method
pip install paypalrestsdk
gem install paypal-sdk-rest
// Maven pom.xml file
<dependency>
  <groupId>com.paypal.sdk</groupId>
  <artifactId>rest-api-sdk</artifactId>
  <version>LATEST</version>
</dependency>

// Gradle
repositories {
  mavenCentral()
}
dependencies {
  compile 'com.paypal.sdk:rest-api-sdk:+'
}
// Run in NuGet package manager
PM> Install-Package PayPal

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Additional information