Assuming this is a Sharp ROKU TV, and that the PIN is one associated with your Roku Account:
If you log into your account at https://my.roku.com you can create or reset a PIN value. You can then choose when the PIN is to be required, such as before it will allow any subscription or purchase to be made on your account.
Doug
Roku Community Streaming Expert I am not a Roku employee, only a user like you.
Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
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