Mayar.id payment integration for generating invoices, payment links, and tracking transactions via MCP. Use when needing to: (1) Create payment invoices/links for customers, (2) Track payment status and transactions, (3) Generate WhatsApp-friendly payment messages, (4) Handle Indonesian payment methods (bank transfer, e-wallet, QRIS), (5) Manage subscriptions/memberships, or (6) Automate payment workflows for e-commerce, services, or digital products.