Google Play InApp Purchase Error Message

I am using “plugin.google.iap.v3” for google play inapp purchase function. However, I got an report from some user showing me that they saw the following error by google play inapp purchase dialog:

Your order is being processed. Your item will be available in a few minutes

I did some search but didn’t found anything about this error. Anyone had the same issue?

Can you reproduce the error in your device? 

Can you reproduce the error in your device?