Installation
Omnipay is installed via Composer.
For most uses, you will need to require league/omnipay and an individual gateway:
composer require league/omnipay:^3 omnipay/paypal
If you want to use your own HTTP Client instead of Guzzle (which is the default for league/omnipay),
you can require omnipay/common and any php-http/client-implementation (see PHP Http)
composer require omnipay/common:^3 omnipay/paypal php-http/buzz-adapter