How to get the one Entity properties into another Entity?

Hi All,

   I'm new to mendix, could you please help on this

  Issue:  I'm working on Twilio two-factor authentication facing the issue in Verify OTP Rest API,  we have two entities (Mobile & OTP).  

  OTP Rest API:

       Once enter the mobile number getting the OTP and call the Rest API.  (inputs - mobile number, country code, api_key) - its working fine

 Verify OTP Rest API:

      Here I have to pass the otp code, mobile number, and country code, How to get the mobile number and country code here?

How to associations for the Mobile & OTP Entities.