I keep a one-tab sheet for any modern research peptides order: date, vendor, lot, payment method, shipping window, and whether the COA link actually opens. Six weeks in, two of four vendors had a changed checkout step and one label photo did not match the site.
No drama yet, but the mismatch is the only thing I care about. I also log written replies to one basic lot/COA question instead of going on vibes.
If a vendor cannot answer that in writing, I cross it off. Long-timers: what column do you add first?
I am considering a cold-chain note but do not want clutter.