1. PHP >= 5.5.0


Using Composer is the recommended way to install the Chargify SDK for PHP. Composer is a dependency management tool for PHP that allows you to declare the dependencies your project needs and installs them into your project. In order to use the SDK with Composer, you must do the following:

Download and install Composer, if you don’t already have it.

curl -sS https://getcomposer.org/installer | php

Add chargely/chargify-sdk-php as a dependency in your project’s composer.json file.

php composer.phar require chargely/chargify-sdk-php:~0.1

Alternatively, you can specify Chargify SDK for PHP as a dependency in your project’s existing composer.json file:

  "require": {
    "chargely/chargify-sdk-php": "~0.1"

Install your dependencies, including your newly added Chargify SDK for PHP.

php composer.phar install

After installing, you need to require Composer’s autoloader:

require 'vendor/autoload.php';

You can find out more on how to install Composer, configure autoloading, and other best-practices for defining dependencies at getcomposer.org.

Bleeding edge

During your development, you can keep up with the latest changes on the master branch by setting the version requirement for Chargify SDK for PHP to ~0.1@dev.

   "require": {
      "chargely/chargify-sdk-php": "~0.1@dev"


Licensed using the Apache 2.0 license.

Copyright (c) 2016 Crucial Web Studio, LLC

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


We work hard to provide a high-quality and useful SDK for Chargify services, and we greatly value feedback and contributions from our community. Please submit your issues or pull requests through GitHub.


  1. The SDK is released under the Apache 2.0 license. Any code you submit will be released under that license. For substantial contributions, we may ask you to sign a Contributor License Agreement (CLA).
  2. The SDK has a minimum PHP version requirement of PHP 5.5. Pull requests must not require a PHP version greater than PHP 5.5 unless the feature is only utilized conditionally.
  3. We follow all of the relevant PSR recommendations from the PHP Framework Interop Group. Please submit code that follows these standards. The PHP CS Fixer tool can be helpful for formatting your code.
  4. We maintain a high percentage of code coverage in our unit tests. If you make changes to the code, please add, update, and/or remove tests as appropriate.
  5. If your code does not conform to the PSR standards or does not include adequate tests, we may ask you to update your pull requests before we accept them. We also reserve the right to deny any pull requests that do not align with our standards or goals.
  6. If you would like to implement support for a significant feature that is not yet available in the SDK, please talk to us beforehand to avoid any duplication of effort.

In order to contribute, you’ll need to checkout the source from GitHub and install Chargify SDK fpr PHP’s dependencies using Composer:

git clone https://github.com/chargely/chargify-sdk-php.git
cd chargify-sdk-php && curl -s http://getcomposer.org/installer | php && ./composer.phar install --dev

Running the tests

The SDK is unit tested with PHPUnit. Run the tests using the following commands:

cd tests/phpunit

# with coverage report
../../vendor/bin/phpunit --coverage-html artifacts/coverage