We have setup an e-commerce site using nopCommerce v3.50 and have downloaded the CCAvenue extension and updated the approciate plugin to the Plugins directory, everything seems to be working fine, only thing when you place an order, click confirm, we get a page on ccavenue which says error code: 10002 and merchant authentication failed.

CCAvenue guys said that put in the proper details in configuration, we re-checked more than 5 times, yet nothing works for us.

Can anyone please point us to a solution for the same?

FYI, we cannot downgrade to any previous version and need to fix this asap.