1) Check and Warning message for minimum php 5.3.0 version requirement added.
2) Fixed the scope operators scope=user_read+invoice_read_write and remove merchant_read (file /admin/view/template/payment/gocoin.tpl)
3) Fixed validations and display of messages & log error (file /catalog/controller/payment/gocoin.php)
1) Change in GoCoin Configration Setting in admin.
2) Change in User Authontication while invoice creation.
3) Change in Signature and hash creation validation.
4) Change in payment validation and log the event.