1. Android Pay (Google Pay will not work on my watch although I read a post by someone who says it works on theirs)
2. Tasker installed on phone
3. Autowear Plugin to Tasker installed on phone and watch
4. A PC with adb installed
Step 1: Enable Developer Options on Watch
Step 2: Turn on ADB Debugging and Debug over WiFi
Step 3: Open command prompt or powershell in the folder where you have adb (hold shift and right click)
Step 4: In powershell, type adb connect 198.162.X.X:5555 (use the actual IP of your watch). Press Enter. The watch will prompt you to accept the connection. Select Always Allow.
Step 5: Type adb shell pm grant com.joaomgcd.autowear android.permission.WRITE_SECURE_SETTINGS. Press Enter. It may take a minute or two but if you don't receive an error, it worked.
Step 6: Open Tasker on your phone. Select Tasks. Hit the + sign in the bottom right. Select Plugin -> Autowear -> Secure Settings. When the new window opens, click the pencil next to Configuration. Set Command to Execute to &CONNECTED&. Click Custom Setting. Setting Type is Global, Name is <NFC>, Input type is Toggle, and Value is 1. Once all those are set, click the back arrow to get back to the AutoWear Secure Settings page. Click the checkmark at the top to save the settings.
Step 7: In powershell on the pc, type adb install com.google.android_apkmirror.com.apk. Press Enter. It should say Success once it finishes.
Step 8: On your phone, under the Task Edit screen (where you should be if you did not exit out from step 6) click the "Play" button on the bottom left. You should get a green dot next to the word configuration at the top.
Step 9: Open Android Pay on the watch. It will take you through the setup and tell you to finish on your phone. Once you finish adding a card, it should show up on the watch. "To pay with your watch, you need to turn on NFC" will show up and blink a couple of times then go away. It should show your card with "Hold to terminal.." above it.
This is something I threw together real quick to get the word out. Like I said in the beginning, I have not tried it at a terminal yet. As soon as I do, I will repost with results. Also in the near future, I will streamline the process, add a command to Tasker to keep NFC on always, and hopefully pay without opening the Android Pay app on the watch (Simply have the watch unlocked). I have attached the Android Pay apk below. If anyone tries this and uses the watch at a terminal, please post results.