a. A PMSI arises when
1) A person obtains credit (borrows money),
2) The credit is used to acquire (purchase) property, and
3) That property serves as collateral to secure the obligation to satisfy the debt
(repay the money borrowed).
EXAMPLE
Caitlin purchased a computer on credit from Hardware Heaven. She also purchased in the same transaction additional software that she planned to install in the computer. Thus, Hardware Heaven (a seller that financed the purchase) has a PMSI in the computer and the software.
So, yes, I think your Macy's card purchases would be a PMSI. A PMSI is an example of an automatic perfection.