Integration Guide

import express from "express";

const app = express();
const CALLBACK_API_KEY = process.env.SCROLLO_CALLBACK_KEY;
const processedTransactions = new Set();

app.use(express.json());

app.post("/api/scrollo/callback", async (req, res) => {
  // 1. Authenticate
  if (req.headers["x-api-key"] !== CALLBACK_API_KEY) {
    return res.status(401).json({ success: false });
  }

  const { event, player_id, transaction_id, amount } = req.body;

  switch (event) {
    case "balance":
      const balance = await getPlayerBalance(player_id);
      return res.json({ success: true, balance_cents: balance });

    case "bet":
      if (processedTransactions.has(transaction_id)) {
        return res.json({ success: true }); // idempotent
      }
      await debitPlayer(player_id, amount);
      processedTransactions.add(transaction_id);
      return res.json({ success: true });

    case "win":
    case "refund":
      if (processedTransactions.has(transaction_id)) {
        return res.json({ success: true }); // idempotent
      }
      await creditPlayer(player_id, amount);
      processedTransactions.add(transaction_id);
      return res.json({ success: true });
  }
});

app.listen(3000);