If you would like to contribute code you can do so through GitHub by forking the repository and sending pull requests.
By contributing your code, you agree to license your contribution under the terms of the APLv2: http://www.apache.org/licenses/LICENSE-2.0
If you are adding a new file it should have a header like this:
/*
* Copyright (c) 2020 EmeraldPay Inc, All Rights Reserved.
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*/