It is necessary to create an app.

Hello!
I am developing a Ukrainian startup called FlowerMat. 
The structure is ready, but an application is needed to automate the entire process. 
FlowerMat is a refrigerated chamber divided into compartments (like a parcel locker) where products are stored in the compartments. On the device, there is a POS terminal that allows customers to make their selection of products and pay for them.
Example of a POS terminal:

https://epicentrk.ua/ua/shop/mplc-terminal-sensornij-pos-58-q3-na-android-bluetooth-wifi-3g-nfc-ta-cekovij-printer-1ee8ae55-9c30-6744-86e6-db50d1e34b8c.html?gad_source=1&gbraid=0AAAAADLIb1OgsAscryIvqPh5OR1Q2akaX&gclid=Cj0KCQjw99e4BhDiARIsAISE7P-CEuEJqJ_Jv1b73arTE31HNC6vWPCGdts9P6g7yCdB80lo6qPNrG4aArgxEALw_wcB
POS terminals are mostly on Android. 

So, what is needed?
An application needs to be created!
Its functionality:
1. The display should show the compartments, specifically their numbers from 1 to 8.
2. After pressing the selected compartment, the user should be redirected to payment through the terminal. To the PrivatBank page, for example, where the amount will already be specified. 
3. The client pays for the selected product with a phone/card. 

And here comes the most interesting part!!!
4. The application needs to open the compartment that the person selected!!!


The locks will be electromechanical. Here is an example: 
https://pl.aliexpress.com/item/1005006275434573.html?spm=a2g0o.productlist.main.27.5ada7dkL7dkLXp&algo_pvid=506d4962-b1c3-4d75-9e7d-76d030d6334b&algo_exp_id=506d4962-b1c3-4d75-9e7d-76d030d6334b-38&pdp_npi=4%40dis%21UAH%2170.79%2170.79%21%21%2112.00%2112.00%21%402103835c17309991578248949e3dba%2112000036571669529%21sea%21UA%210%21ABX&curPageLogUid=2YcITK3tJPzA&utparam-url=scene%3Asearch%7Cquery_from%3A
There are many such locks. 

Also, these locks need to be connected to something, and the idea was to connect them to a relay. Here is an example:
https://prom.ua/ua/p656537381-usb-rele-kanalnyj.html?utm_source=google_pmax&utm_medium=cpc&utm_content=pmax&utm_campaign=Pmax_cpa_1_50_tehnika_i_elektronika_5297199152&gad_source=1&gbraid=0AAAAADBxJSXRukI7OA0DQ0z9G0Zv2Wihm&gclid=Cj0KCQiA6Ou5BhCrARIsAPoTxrDHgb2DoNuiOGspnVZjKOLDGLtYB04xS02yQZJG4awjXQG2CW02P4EaAkvXEALw_wcB

This is quite a puzzle. I would appreciate your help in implementing this project. You can send all details and proposals to my Telegram: zorin666666
I am located in Kyiv. 

P.S. FlowerMats are indoor. That means they will always have power for lighting and Wi-Fi connection.