Need help with correct installation of GTM on the site

Deep Project Description 1. Executive Summary Hrafi is an on-demand digital marketplace designed to bridge the gap between Moroccan consumers and local service professionals (Hrafiyin). Inspired by US platforms like Thumbtack, Hrafi transforms how home maintenance and skilled services are booked in Morocco—replacing unreliable word-of-mouth with a transparent, trusted, and efficient mobile platform. 2. The Problem For Customers: Finding reliable, skilled handymen (plumbers, electricians, painters) in Moroccan cities is time-consuming. Price transparency is nonexistent, quality is unpredictable, and safety/trust remains a primary concern. For Service Professionals: Skilled tradespeople rely heavily on informal networks or physical gathering points (mawqif). They lack modern tools to build a steady client base, track income, or display their work portfolio

Development of an MVP online tutoring platform (analogous to Preply) for the Lithuanian marketProject description:We are looking for a team of developers or individual specialists (Full-stack / Backend / Frontend / UI-UX) to create a two-sided online learning marketplace for the Lithuanian market.The goal of the project is to launch a web platform that connects students with freelance tutors for conducting individual lessons in real time.Main functionality of the MVP: Tutor's cabinet: Profile with a video introduction, upload of diplomas, schedule setup (calendar) and hourly rates. Student's cabinet: Search by filters (subject, price, language, rating), purchase of lessons, personal class calendar. Search and filtering: Smart matching of teachers with a review and rating system. Virtual classroom: Integration of video communication (WebRTC, Zoom or similar), built-in chat and file sharing. Payment system: Secure transaction (Escrow). Freezing of funds and payment to the freelancer after lesson confirmation. Integration with Stripe / Paysera is needed.

Good day It is necessary to create a module that will work with the Firebird database in C++ for selling products. There are examples of ready-made solutions and a description of the module's functionality. Main functions: authorization, selection of products on the screen from groups/subgroups, transition to the cart, payment by card, and printing the receipt. The program must work on Windows 10 and above, using the existing database.

Write and create a mobile application. A creative and highly professional approach is needed, as the idea of the application is not ordinary)