Here you can find some of the most used scripts for Postman testing.

At least some of the most used by me :-)

(pm-objects.js)

• Global variables
• Environment variables

To send a request via the sandbox, you can use pm.sendRequest.

pm.test("Status code is 200", function () {
    pm.sendRequest('https://postman-echo.com/get', function (err, res) {
        pm.expect(err).to.not.be.ok;
        pm.expect(res).to.have.property('code', 200);
        pm.expect(res).to.have.property('status', 'OK');
    });
});