Make Change in App with Ionic 3 in register screen

I have an app, and need help to add a Change: 1.- We will let register in the app, only to the client that have the Telephone Number from a salesman. In the register screen, we will to add a field where fill the Telephone Number from the Salesman(TNS), and when the register send, the app will to validate if the TNS found in the TNS_table(New table), and if is a TNS valid, the register will be successful see scren ilustration: [login to view URL] 2.- Make the apk I will send the icons, images, app name and language Note: I will need 2 versions, the first will to include the point 1 In this version I will review the language and the images. The version 2 is the finish (to publish in Play Store). Must include the full source code with this 2 changes. Detail Tech: TNS_table have 2 fields, 1.-TNS (is numeric) 2.-Salesman full name (varchar 30)