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Handling No Internet for IAP?

Are there any tutorials which address the possibility of the user not having internet access for calling the IAP prices? Right now my IAP buttons simply stay blank. I'd like to flip them to be a Check button if they couldn't get the prices in time. In my head, I think I would just check if the purchasetable cells are blank, but I'm not sure which variable types can use a blank cell as a proper state to trigger an action off of, or what counts as a blank cell when filling out the check.


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