HOTO install GSPAY payment module for Opencart system 
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1. Unpack (unzip) archive into temp directory
2. Place (upload by ftp) includes folder to the your Opencart base directory on server
3. Check that all files listed below exists on server:
    admin/controller/extension/payment/gspay.php
    admin/language/en-gb/extension/payment/gspay.php
    admin/view/image/payment/gspay.png
    admin/view/template/extension/payment/gspay.twig
    catalog/controller/extension/payment/gspay.php
    catalog/language/en-gb/extension/payment/gspay.php
    catalog/model/extension/payment/gspay.php
    catalog/view/theme/default/template/extension/payment/gspay.twig
4. Check that your PHP includes CURL with SSL support (see http://www.php.net/manual/en/ref.curl.php for details or contact your hoster)
5. Open Opencart admin panel in web browser
6. Open "Extensions->Payments" section
7. Select "Gspay" module  and click to "install" button
8. Enter site ID of your site in GSPAY system (i.e. number like 61540, NOT your merchant ID) into Site ID field.
9. Save setup

