I have an existing Magento 2.1 store, and I need to add a custom payment method existing in my country for this store. I only need the code, no installation required. I will NOT give access to any development environments, so this has to be coded in the developer's local environment. The installation of the code will be handled by me (I have experience developing other simpler modules, and installing them).
In the attachment you will find two things, please review them before posting a bid:
1. Sample code that includes an external free library with composer (composer knowledge required for this project). This sample code generates all the interactions needed to work with the sample code, all that is needed is to put this into M2. You can execute the sample code by entering to localhost/code/web
2. Flow diagram explaining the interactions between the user, magento and the payment portal.
The payment needs to be behind the following vendor name: "DSY".