Converted APIs to OAuth but still receiving Authtoken warnings

We converted all of our API calls to OAuth, yet we are still receiving the "Replace Authtokens with OAuth immediately" notification when logging into Subscriptions.

The API Usage Dashboard shows several transactions, all being processed at the top of the hour, and on the half hour (see attachment for screenshot). This tells me something automated is happening, as the times are not random like when a user would register or login.

We've searched through our code and can not find anything that would be causing this. We do not have any cron jobs set up, so we can rule that out.

The only thing I can think of is that we are using Authorize.net as they payment processor, but that's hooked up directly through Zoho, so we aren't connecting to them through our app.

Does Authorize.net send information back to Zoho via Authtokens? If so, where can I find this to update it?

Does anyone have any idea what could be going on, and how we can fix this?

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Jaye Massey
Hari | Zoho Billing

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