feat: add PayPal MCP server definition (#58)

* Add PayPal MCP server definition

Official PayPal MCP server for payments, invoices, orders, and subscriptions.
Uses @paypal/mcp npm package with stdio transport.

https://claude.ai/code/session_013AxurW8hPAfnUNvik354Xx

* fix: update server definition (input type 'password' -> 'text' for PAYPAL_ACCESS_TOKEN)

* fix: rename server files with transport suffix

- com.paypal-mcp.json -> com.paypal-mcp-npx.json (id: com.paypal-mcp-npx)

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

---------

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

servers/com.paypal-mcp-npx.json

@@ -0,0 +1,83 @@
+{
+  "$schema": "../schemas/server-definition.schema.json",
+  "id": "com.paypal-mcp-npx",
+  "name": "PayPal (npx)",
+  "alias": "paypal",
+  "description": "Process payments, manage orders, create invoices, handle disputes, and manage products and subscriptions through the PayPal API.",
+  "icon": "https://avatars.githubusercontent.com/u/476675?v=4",
+  "schema_version": "2.1",
+  "categories": [
+    "cloud"
+  ],
+  "tags": [
+    "paypal",
+    "payments",
+    "invoices",
+    "orders",
+    "subscriptions",
+    "checkout"
+  ],
+  "transport": {
+    "type": "stdio",
+    "command": "npx",
+    "args": [
+      "-y",
+      "@paypal/mcp",
+      "--tools=all"
+    ],
+    "env": {
+      "PAYPAL_ACCESS_TOKEN": "${input:PAYPAL_ACCESS_TOKEN}",
+      "PAYPAL_ENVIRONMENT": "${input:PAYPAL_ENVIRONMENT}"
+    },
+    "metadata": {
+      "inputs": [
+        {
+          "id": "PAYPAL_ACCESS_TOKEN",
+          "label": "PayPal Access Token",
+          "description": "OAuth 2.0 access token for the PayPal REST API.",
+          "type": "text",
+          "required": true,
+          "secret": true,
+          "placeholder": "A21AAxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
+          "obtain": {
+            "url": "https://developer.paypal.com/dashboard/applications",
+            "instructions": "1. Go to developer.paypal.com/dashboard\n2. Create or select an app\n3. Get your Client ID and Secret\n4. Generate an access token using the OAuth2 endpoint",
+            "button_label": "Get Credentials"
+          }
+        },
+        {
+          "id": "PAYPAL_ENVIRONMENT",
+          "label": "PayPal Environment",
+          "description": "Use SANDBOX for testing or PRODUCTION for live payments.",
+          "type": "text",
+          "required": false,
+          "secret": false,
+          "placeholder": "SANDBOX"
+        }
+      ]
+    }
+  },
+  "auth": {
+    "type": "api_key",
+    "instructions": "Generate an access token from your PayPal app at https://developer.paypal.com/dashboard/applications"
+  },
+  "contributor": {
+    "name": "PayPal",
+    "github": "paypal",
+    "url": "https://www.paypal.com"
+  },
+  "links": {
+    "repository": "https://github.com/paypal/paypal-mcp-server",
+    "homepage": "https://www.paypal.com",
+    "documentation": "https://developer.paypal.com/docs"
+  },
+  "platforms": [
+    "all"
+  ],
+  "capabilities": {
+    "tools": true,
+    "resources": false,
+    "prompts": false,
+    "read_only_mode": false
+  }
+}