Copy the files from this plugin into the corresponding folders on your installation, as mentioned below:
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Copy the gateways/upifast.php file into your installation's /module/gateways/ folder
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Copy the gateways/callback/upifast.php file into your installation's /module/gateways/callback folder.
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Copy the gateways/callback/upifast_callback.php file into your installation's /module/gateways/callback folder.
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Copy the gateways/upifast folder into your /module/gateways folder
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If you got some error related Sql then Add the SQL Manually from gateways/sql.sql file into your phomyadmin