Laravel payment gateway solutions
Omnipay package
https://github.com/thephpleague/omnipay
Payway
https://github.com/Moult/omnipay-payway
PayPal on Laravel 5.2 code example
https://laracasts.com/discuss/channels/laravel/paypal-on-laravel-5222
WestPac payway official document
https://www.westpac.com.au/business-banking/merchant-services/online-payments/
https://www.payway.com.au/downloads/WBC/PayWay_API_Developers_Guide.pdf