@derek4sally
What was it you purchased ??
Without paymernt details, passwords etc the info you mention is useless to anyone & as pointed out that info is supplied to all sellers with your payment
In order to process transactions some business sellers create an account (not a payments or ordering account) on their systems for the purchase......
It would only be a data breach if that seller passed on the details to a 3rd party not involved in a transaction with you
GDPR allows eBay to pass on any information required to fulfill your order which will include
Username
Given Name
Email address
Delivery Address
Phone number
