docs: add payments infrastructure page with stellartools

docs/tools/developer-tools/payments-infrastructure.mdx

@@ -0,0 +1,26 @@
+---
+title: Payments Infrastructure
+description: Tools and platforms for accepting payments, running subscriptions, and paying out on Stellar.
+sidebar_label: Payments Infrastructure
+sidebar_position: 110
+---
+
+# Payments Infrastructure
+
+Payments infrastructure tools help developers accept payments, run recurring billing, and pay out funds on Stellar without building the money-movement layer from scratch. These platforms sit on top of the network and expose higher-level primitives like checkout, subscriptions, and payouts.
+
+### [StellarTools](https://stellartools.dev)
+
+StellarTools is an open-source, Stripe-like payments platform built on Stellar. It lets developers accept crypto payments, run subscriptions, charge by usage, and pay out to local currencies, with payments settling in seconds for fractions of a cent.
+
+Features include:
+
+- One-time and recurring checkout pages, hosted with your own branding
+- Subscription billing with trials, pause, resume, and cancel-at-period-end
+- Customer portal where users manage their own subscriptions and invoices
+- Global payouts to local currencies (NGN, KES, GHS, and more)
+- Real-time webhooks for payment, subscription, and customer events
+- A TypeScript-first SDK (`@stellartools/core`) for React and vanilla JavaScript
+- An MCP server so AI agents can manage customers, payments, and subscriptions
+
+StellarTools is free and [open source](https://github.com/payrouteshq/stellartools). Learn more in the [StellarTools documentation](https://docs.stellartools.dev).

routes.txt

@@ -768,6 +768,7 @@
 /docs/tools/developer-tools/network-status
 /docs/tools/developer-tools/node-operator-tools
 /docs/tools/developer-tools/online-ide
+/docs/tools/developer-tools/payments-infrastructure
 /docs/tools/developer-tools/security-tools
 /docs/tools/developer-tools/wallets
 /docs/tools/infra-tools