🤖 Generate images via Telegram using an AI bot with a credit system and S3 storage

A complete, production-ready Telegram bot for AI-powered image generation and editing, featuring a built-in credit system, payment integration, and cloud storage.

✨ Features

🎨 AI Image Generation

• Text-to-Image: Generate stunning images from text prompts using the Nano Banana Pro Ultra model via WaveSpeed API
• Image-to-Image Editing: Edit existing images by sending a photo with a caption describing the desired changes
• Multiple Resolutions: Support for both 4K and 8K output quality
• Flexible Aspect Ratios: Choose from 10 different aspect ratios (1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9)

💳 Credit Management System

• Per-generation billing: Different costs for 4K vs 8K resolution
• Balance tracking: Real-time credit balance displayed to users
• Initial credits: New users receive starter credits automatically
• Insufficient balance handling: Graceful messages when credits run out

Here's the adjusted payment section:

💰 Payment Integration (Mercado Pago PIX)

About PIX: PIX is Brazil's instant payment system, launched by the Central Bank of Brazil in 2020. It allows instant money transfers 24/7, 365 days a year, using QR codes or copy-paste codes. It has become the most popular payment method in Brazil due to its speed and zero fees for individuals.

This workflow includes a fully integrated PIX payment flow as a reference implementation. You can adapt it to your local payment provider.

Features:

• Multiple deposit options: Pre-configured credit packages (R$ 3, R$ 6, R$ 10)
• QR Code generation: Automatic PIX QR code sent directly to users via Telegram
• Copy-paste code: PIX code provided for manual payment
• Webhook confirmation: Real-time payment status updates via Mercado Pago webhooks
• Auto credit top-up: Credits added automatically upon payment approval
• Payment status handling: Supports approved, pending, and rejected states

💡 Tip: To adapt this for other regions, replace the Mercado Pago nodes with your preferred payment gateway (Stripe, PayPal, etc.) while keeping the same credit update logic.

⚙️ User Configuration

• Resolution settings: Users can set their preferred default resolution
• Aspect ratio preferences: Save preferred aspect ratio for future generations
• Custom default prompts: Set a default prompt that's automatically appended to all generations
• Persistent settings: All preferences stored in n8n Data Tables

📦 Cloud Storage (S3/MinIO)

• Automatic upload: Generated images are automatically uploaded to S3-compatible storage
• Persistent URLs: Images remain accessible via permanent links
• Edit from storage: Reference previously uploaded images for editing

🛠️ Tech Stack

📋 Prerequisites

Before using this workflow, you'll need:

1. Telegram Bot Token - Create a bot via @BotFather
2. WaveSpeed API Key - Sign up at WaveSpeed
3. S3-compatible Storage - MinIO, AWS S3, or any S3-compatible service
4. Mercado Pago Account (optional) - For payment integration
5. n8n Data Table - Create a table with the required schema

📊 Data Table Schema

Create a Data Table with the following columns:

⚡ Quick Setup

1. Import the workflow into your n8n instance
2. Configure the Global Environment node with your settings:
   • botName: Your bot's display name
   • botToken: Your Telegram bot token
   • dataTableId: Your n8n Data Table ID
   • bucketName: Your S3 bucket name
   • initialCredits: Credits given to new users
   • generateImageCost4k: Cost per 4K image
   • generateImageCost8k: Cost per 8K image
3. Set up credentials:
   • Telegram API credentials
   • WaveSpeed API credentials
   • S3 credentials
   • Mercado Pago credentials (if using payments)
4. Activate the workflow

🎮 Bot Commands

🔄 Workflow Flow

User Message → Telegram Trigger → Route by Status
                                        ↓
                    ┌───────────────────┼───────────────────┐
                    ↓                   ↓                   ↓
              New User            Generate Image       Edit Image
                    ↓                   ↓                   ↓
             Welcome Flow        Check Credits        Check Credits
                    ↓                   ↓                   ↓
            Create User         Submit to WaveSpeed    Upload to S3
                    ↓                   ↓                   ↓
             Show Menu           Poll for Result      Submit Edit
                                        ↓                   ↓
                                 Download Image      Poll for Result
                                        ↓                   ↓
                                 Send to User ←←←←←←←←←←←←←┘

📝 Notes

• The workflow uses polling to check generation status - WaveSpeed processes may take up to 1 minute
• Credits are deducted when the task is submitted and refunded if generation fails
• All user states are managed through the Data Table for persistence across restarts

📄 License

Free to use and modify. Attribution appreciated but not required.