This is a non-merchant gateway for Blesta that integrates with Wide Pay.
You can install the gateway via composer:
composer require blesta/widepay
Upload the source code to a /components/gateways/nonmerchant/widepay/ directory within your Blesta installation path.
Log in to your admin Blesta account and navigate to
Settings > Payment Gateways
Find the Wide Pay gateway and click the "Install" button to install it
Set wallet ID and token
Set up custom client field (see https://docs.blesta.com/display/user/Wide+Pay)