Shopify specs for REST API order line properties element

New Member
1 0 0

Our 3PL system has the ability to download Shopify orders via the REST API. They're getting errors on one Shopify store because they're claiming they're receiving out of spec values on the Order Line properties element. 

Specifically, they're receiving this (bracketed/quoted value):


When they claim they should be receiving this (quoted value):


They're saying that according to Shopify documentation, the properties:tag value should be a string, not an array. I've looked through the Shopify docs but can't find a definitive answer on this.

Can anyone point me to the precise specs for the properties element? Or does anyone know for certain that passing an array is out of spec?