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Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Are you wanting to make the panasonic phone just a 3 line system then and completely divert the 4th line to the merchant terminal?
I'm also not quite clear if you want a separate handset on the 4th line shared with the card machine, or if you wand to add a whole additional desk station to the panasonic system?