Bot auto sales of digital goods (VPN subscription) using Yoomoney API and Sellix API (bank card and bitcoin). The main part uses MongoDB, bitcoin payment data and bitcoin payment status tracking uses SQLite.

StrongMod allows you to create mods for Stronghold Crusader 1

Allows players to automatically repair their gear using guild funds or their own gold, and also automatically sells any items in their inventory that can be sold to a vendor.

Skip the basic CRUD—this Backend Crash Course is all about building a production-ready Subscription Management System with real users, real money, and real business logic. You'll learn JWT authentication, database modeling, API architecture, security, automated workflows, and much more!