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from flask import Flask, request, jsonify
import base64, hashlib, hmac, rsa
app = Flask(__name__)
# ⚙️ Replace this with your real PayerMax private key (PEM string)
PRIVATE_KEY = """-----BEGIN RSA PRIVATE KEY-----
MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCDS2Bp66DKBHgW
CYs9ujP8N0Y60HDRcKmhApoCCI3qK4UE8KuaI/bobAbFr4f7bIU3WUnjtiuP1OUh
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xO3lVx0gqIZWOjCqjqBKPG6U=
-----END RSA PRIVATE KEY-----"""
# ✅ 1. PayerMax callback endpoint
@app.route("/payermax", methods=["POST", "GET"])
def payermax_notify():
try:
print("✅ PayerMax callback received")
data = request.get_json(force=True, silent=True)
print("🧾 Data:", data)
return "success", 200
except Exception as e:
print("🔥 Error in PayerMax callback:", str(e))
return "success", 200
# ✅ 2. FlutterFlow test endpoint
@app.route("/test", methods=["POST"])
def test_endpoint():
try:
data = request.get_json(force=True, silent=True)
print("🧪 FlutterFlow test data:", data)
return jsonify({
"status": "ok",
"message": "Received test data successfully!",
"echo": data
}), 200
except Exception as e:
print("🔥 Error in test endpoint:", str(e))
return jsonify({"status": "error", "message": str(e)}), 500
# ✅ 3. Signature generator endpoint
@app.route("/sign", methods=["POST"])
def sign_payload():
"""
Generate RSA-SHA256 signature for a given string payload.
Body: { "payload": "string-to-sign" }
Returns: { "sign": "base64_signature" }
"""
try:
import base64
from Crypto.PublicKey import RSA
from Crypto.Signature import pkcs1_15
from Crypto.Hash import SHA256
data = request.get_json(force=True)
payload = data.get("payload", "")
if not payload:
return jsonify({"error": "Missing 'payload' field"}), 400
# Load your PEM private key
private_key = RSA.import_key(PRIVATE_KEY)
# Compute SHA256 hash of the exact payload string
h = SHA256.new(payload.encode('utf-8'))
# Sign it
signature = pkcs1_15.new(private_key).sign(h)
# Return base64-encoded signature as 'sign' (what your custom action expects)
signature_b64 = base64.b64encode(signature).decode('utf-8')
return jsonify({"sign": signature_b64}), 200
except Exception as e:
print("🔥 Error generating signature:", str(e))
return jsonify({"error": str(e)}), 500
if __name__ == "__main__":
app.run(host="0.0.0.0", port=7860)
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