Export your postman collection & create k6 script using below commands.
Install K6 load testing tool follow this https://k6.io/docs/getting-started/installation
If not installed postman-to-k6 install:
npm install -g postman-to-k6
Run postman-to-k6:
postman-to-k6 COLLECTION_NAME.postman_collection.json -o k6-script.js
Initialize environment configuration:
cp json.js.shadow json.js
cp constants.js.shadow constants.js
Run k6 script:
k6 run k6-script.js