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Get the register’s setup

When a key is created in the portal (Settings → POS Gateway → Register keys), the key screen offers Download register setup. Choose which POS it’s for: The download is a zip with:
register-key.txt holds the key’s secret. Enter the key in your POS, then delete the file.

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Install it

1

Copy the files

Unzip, and copy the program and appsettings.json into the folder your POS runs it from. Both must be in the same folder.
2

Enter the key in your POS

Where your POS asks for the CardPointe username and password: the key id and the secret.
3

Check it

From that folder:
test.txt should contain "Hello World". Then run a small sale from the POS and void it.

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Updating

Replace the program with the one from a newer setup download; keep your appsettings.json. mojo --version shows the version you have.
Windows may warn that the program is from an unknown publisher the first time it runs. Choose More info → Run anyway for mojo.exe from your Mojo Payments setup download.