This worked for me as well. I have an LG V30 and was trying to set up Samsung Pay. In the Wear app I clicked "Open Samsung Pay" and a message popped up at the bottom of the screen saying "Installing Samsung Pay (wear plug-in)" then it would go away. I would then click "Open Samsung Pay" and this message would pop up again. This continued on a loop every time I would try to get samsung pay to work. The solution is to install the APK manually downloaded from the internet. Everything functions fine now.
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