Hi, I did similar project before.
Can you provide more details?
Is native or hybrid app?
Do you need print on english only or russian also?
Usually that printers has BT4 and 58mm or 80mm. Which one do you have?
Cheap and popular models (clones available):
https://www.amazon.com/DLMZY-POS-5807-Wireless-Bluetooth-Compatible/dp/B07L1D4BR2/ref=sr_1_9?s=office-electronics&ie=UTF8&qid=1545291057&sr=1-9&keywords=receipt+printer&refinements=p_n_feature_four_browse-bin%3A5662320011
https://www.amazon.com/Officelead-Portable-Wireless-Bluetooth-Compatible/dp/B07JLW8V68/ref=sr_1_17?s=office-electronics&ie=UTF8&qid=1545291057&sr=1-17&keywords=receipt+printer&refinements=p_n_feature_four_browse-bin%3A5662320011
Waiting for your message to start discussion.
Best regards, Denis