Gpay not working in my iPhone X

Sathish ~ As your iPhone X could be 6½ years old, and a variety of problems can be caused by a weak, aging battery...

Does your iPhone X still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Contact google. GPay is not an Apple product or service.

I seriously doubt the state of the battery has anything to do with this.