using

composer require soheylak/omnipay-saman-mock

assign port number

php -S localhost:9005

http://localhost:9005/src/TestMessage/PaymentToken.json
http://localhost:9005/src/TestMessage/PaymentTokenFailure.json
http://localhost:9005/src/TestMessage/VerifyOrder.json
http://localhost:9005/src/TestMessage/VerifyOrderFailure.json