Hey @neds2021,
Thanks for getting in touch with us here in the Seller Community!
Square Readers don't store personal data, and can be used on different Square accounts. Just keep in mind you can only pair the reader to one phone, or tablet at a time, and be sure to be signed in to the Square account you're wanting to take payments for in app.
Please let us know if you have any further questions, we're happy to help!
