Travis CI integration

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "cybersource-rest-samples-php"]
+	path = cybersource-rest-samples-php
+	url = https://github.com/CyberSource/cybersource-rest-samples-php
+	ignore = dirty

.travis.yml

@@ -0,0 +1,27 @@
+language: php
+
+php:
+    - 5.6
+    - 7.0
+    - 7.1
+    - 8.0
+
+sudo: false
+
+before_install:
+    - composer validate 
+
+install:
+    - composer update --prefer-dist
+
+before_script:
+    - git submodule update --remote --recursive
+    - cd cybersource-rest-samples-php
+    - composer update --prefer-dist
+    - cd ..
+    - rm -Rf cybersource-rest-samples-php/vendor/cybersource/rest-client-php/lib
+    - cp -R lib cybersource-rest-samples-php/vendor/cybersource/rest-client-php
+
+script:
+    - cd cybersource-rest-samples-php
+    - bash sample_code_runner.sh

README.md

@@ -1,5 +1,7 @@
 # PHP Client SDK for CyberSource REST APIs
 
+[![Build Status](https://travis-ci.com/CyberSource/cybersource-rest-client-php.svg?branch=master)](https://travis-ci.com/CyberSource/cybersource-rest-client-php)
+
 The CyberSource PHP client provides convenient access to the [CyberSource REST API](https://developer.cybersource.com/api/reference/api-reference.html) from your PHP application.
 
 [![Version         ][packagist_badge]][packagist]