Deprecated function: Return type of OfferPrice::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void ...

I switched over to thewirecutter/paapi5-php-sdk since it's up to date and works with modern Drupal. I'd recommend pulling that in through composer so that you don't run into these issues.

Thank you very much.
This seems to work.

This was fixed in https://www.drupal.org/project/amazon_paapi/issues/3286059 📌 Automated Drupal 10 compatibility fixes Fixed , thank you again RyanCMcConnell.