Feature Request: Add Native Payment Service Integration to Appwrite

### 🔖 Enhancement description I would like to request the addition of a native payment service integration within Appwrite. This feature would enable developers to seamlessly handle payments directly within the Appwrite ecosystem, reducing the need for external integrations and simplifying backend architecture. ### 🎤 Pitch Problem Statement Currently, developers using Appwrite must rely on third-party services (e.g., Stripe, PayPal, Paystack, M-Pesa, etc.) and manually integrate them into their applications. This introduces additional complexity, including: Managing external SDKs and APIs Handling webhooks and security concerns Maintaining separate systems for payments and backend logic Proposed Solution Introduce a built-in Payment Service Module in Appwrite that supports: Payment processing (one-time and subscriptions) Multi-provider support (Stripe, PayPal, Paystack, M-Pesa, etc.) Webhook management and event handling Secure transaction logging and history User billing profiles and payment methods SDK support across Appwrite-supported languages Suggested Features Unified API for handling payments across providers Subscription and recurring billing support Transaction history stored in Appwrite Database Secure handling of sensitive payment data Serverless function triggers for payment events (success, failure, refund) Support for region-specific providers (e.g., M-Pesa for Africa) Use Cases SaaS platforms with subscription billing Marketplaces handling buyer/seller transactions Donation platforms Pay-per-use APIs or services Benefits Reduces development time and complexity Keeps backend logic centralized within Appwrite Encourages wider adoption of Appwrite for production-grade apps Improves developer experience, especially for startups and indie developers Additional Context As a developer building fintech and platform-based applications, having a native payment solution within Appwrite would significantly streamline workflows and reduce dependency on multiple …