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Paysum

Connect a client

Add the Paysum MCP server to Cursor, Claude, VS Code, Windsurf and other clients.

Create a key in Dashboard → Developers → API keys with the Store API scopes you want the assistant to have. Start read-only; you can always make a second key with write access later.

Add this to .cursor/mcp.json in your project, or ~/.cursor/mcp.json for every project. Cursor fills in the key from your environment.

.cursor/mcp.json 
{
  "mcpServers": {
    "paysum": {
      "url": "https://paysum.io/api/mcp",
      "headers": {
        "Authorization": "Bearer ${env:PAYSUM_API_KEY}"
      }
    }
  }
}

Any other client #

Point a Streamable HTTP client at https://paysum.io/api/mcp and send the key as a bearer token. To check a key from the terminal:

curl https://paysum.io/api/mcp \
  -H "Authorization: Bearer $PAYSUM_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'