The Postman API allows you to grab a list of Collections and reimport them into your app again. To do so, proceed as follows.
1 - Generate Postman API key here (if you don’t have one already).
2 - Use the /collections endpoint returns a list of all collections – Postman
Make sure to add the X-Api-Key header and add the key as the value.
3 - Hit send. It should return a list of all collections that are accessible by you (i.e your own collections and the ones you have subscribed to).
4 - Retrieve the UID associated with the collection you need to recover and pass it as a parameter to the GET Single Collection endpoint - Postman
Make sure to add the X-Api-Key header and add the key as the value.
5 - Receive the JSON response and copy/paste it into the Import modal in-app as raw text.