Postman Pre-request script

问题:

I am trying to hit a particular API, which actually send the OTP to customers, their is not Rate Limiter is their on this API, So I am trying to write a pre-request script that will run multiple times, in which I pass the two numbers in the code given below, but main problem is it is not working for the two numbers, it takes only one number which is I pass in the body of the postman which is in JSON format, it doesn't go in the script, please help me to solving this

Postman Request Type : POST

API URL : http:// (API URL)

Body :

{"mobile_number":"94XXXXXXXX","template":"login","countryCode":"91"}

Pre-request Script:

var mobiles = postman.getEnvironmentVariable("mobiles");

if (!mobiles)
  {
    mobiles =["88XXXXXXXX","80XXXXXXXX"];  
  }

var currentMobile = mobiles.shift();
postman.setEnvironmentVariable("mobile", currentMobile);
postman.setEnvironmentVariable("mobiles", mobiles);

Tests:

var mobiles = postman.getEnvironmentVariable("mobiles");

if (mobiles && mobiles.lenght > 0)
  {
    postman.setNextRequest("API URL");  
  }
  else
  {
      postman.setNextRequest("null");
  }

P.S : I am not sharing the API url here, and the mobile number . Sorry for that