Further to my previous comment, I have had a look at the ETSY API reference documentation on the topic:

https://developer.etsy.com/documentation/reference/#operation/getShopReceiptTransaction

You are currently bringing in the “shipping_profile_id” and should be bringing in the “shipping_method” or the “shipping_upgrade” if the buyer purchased an upgrade to their shipping:

I have just seen an order come in with a store postage method but it is not correct. You are pulling in our shipping profile which could include multiple profiles in the same order depending on what it purchased.

The store postage method should be "Standard Shipping", "Express", "Economy" , "1 Day" (these 4 are ETSY standard titles) or a custom title a store could apply to a shipping method.