Postman_collection-V1.json -output-version 1.0.0 -pretty -overwrite Postman_collection-V2.json -input-version 2.0.0 -output. postman-collection-transformer convert -input. For more information on the NPM package go through this link. Step 3: Run the following command to generate the V1 collection. Step 2: Generate the Postman collection from Postman Step 1: Install the NPM package postman-collection-transformer using the following command npm install -g postman-collection-transformer There is a NPM package by the name Postman Collection Transformer to rescue which helps converting the collection to V1 and vice versa. The current version of collections exported from Postman is V2. As of time I am writing this article, to create a custom connector using Postman collection in Power Automate the version of Postman collection has to be V1. Postman collections makes the creation of custom connectors in Power Automate easier & quicker.