we need to build android marketing app for retailers to connect farmers

i want to make android app.
i want to make same app like this. https://play.google.com/store/apps/details?id=com.farmart.retailer&hl=en_AU

in which we send sms to farmers from agri retailer(Shops) to purchase product from us. you download it and understand it.

we have twilio credit also. so can you make like this for sending sms.
yes only one api for send sms throw twilio.

https://www.youtube.com/watch?v=K7U0bl3vaAQ
you see video of this app working madel.

https://www.youtube.com/watch?v=CNXEMh2lQV0