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The method of storing a list of values in Postman is by creating a CSV file with the list of values and then uploading it in the Data section of the Postman collection.

To select a random value from the list to use in an API call, follow these steps:

1. In the request where the value needs to be inserted, use double curly braces {{}} to surround the placeholder where you want the random value to be inserted. For example, "{{randomValue}}".

2. In the Pre-request Script section of the request, write the following code:

const data = pm.iterationData.toObject();
const randomValue = data[Math.floor(Math.random() * data.length)];
pm.environment.set("randomValue", randomValue);

This code retrieves the list of values from the CSV file, selects a random value from the list, and sets it as an environment variable named "randomValue".

1. Save the Pre-request Script and run the request. The selected random value will be inserted in the request where the placeholder was added.