Parcelify: Shipping Rates

Parcelify works for exactly what I wanted to be able to do - offer letter mail rates to customers who only purchase flat items that can be shipped in an envelope. I just ran into a bug that was causing the letter mail rate to show to all customers; the Parcelify support team was amazing and went above and beyond to check that my issue was resolved. Definitely recommend - and shout out to Alex! :)