Squareup Credential Authentication Fix

My Squareup Hosted Checkout keeps throwing authentication errors and I’m convinced the trouble sits inside the payment-method settings of my panel. I need a fresh pair of eyes to confirm that the correct Client ID and Client Secret from my Square developer dashboard are in place, that the environment (sandbox vs. production) is set properly, and that any required redirect or webhook URLs match what Square expects.

You’ll log in, trace the credential flow, adjust anything that’s off, then run a quick test transaction so I can see a clean “approved” response instead of the current auth failure. A short hand-off note explaining what was changed will wrap it up.

If you know your way around Squareup APIs, OAuth flows, and hosted checkout settings, this should be a fast win for both of us.