How to enable in-app purchases on my Meizu phone?

I try to make a purchase on episode but this message pops up:

"In-app puchases are currently disabled for this device. Enable them from the device settings to make a puchase. "

I've looked everywhere but I couldn't found the settings. I've also turn off the authentication for puchases but it didn, 't work.  Please help :(

I'm using meizu m2 note

Hi Angel. Are you using Google Play store?

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