To obtain a Zoho Billing refresh token, perform the following steps:
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Run the ODBC Administrator utility and make proper settings in the Configuration dialog of the driver.
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Click Sign in to Zoho.

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In the appeared Sign in dialog, enter your Zoho Billing account credentials and click Sign in

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To proceed, click Accept.

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Next, you'll see a request message "Please return to the application." at the top left of the screen.
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In case of successful operation, the refresh token is generated right away and is automatically inserted in the corresponding field of the driver configuration window.
Please note, that the Save Token check box is selected by default to save the refresh token.

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Finally, you can access your Zoho Billing data.