I have looked for some similar questions but I cannot understand how.
It is the default Amazon payment module that comes with Magento 2
I am editing this file
but it is not having an effect (it also did setup: upgrade, s: s: d, c: f ..)
/ ** * Copyright 2016 Amazon.com, Inc. or its affiliates. All rights reserved. * * * Licensed under the Apache License, Version 2.0 (the "License"). * You cannot use this file except in compliance with the License. * A copy of the License is in * * * http://aws.amazon.com/apache2.0 * * * or in the "license" file that accompanies this file. This file is distributed. * "AS IS", WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language that governs * permissions and limitations under the License. * /