complete_demo.py

"""
Complete end-to-end B402 demo: Setup + Payment

This script shows the full workflow:
1. Check if approval is needed
2. Approve if needed (one-time)
3. Send payment (gasless)
"""

from b402 import B402

# Initialize B402 client
b402 = B402()

print("=== B402 Payment Demo ===\n")

# Step 1: Check approval
print("Step 1: Checking approval...")
approved, allowance = b402.check_approval("USD1")

if approved:
    print(f"✅ Already approved! Allowance: {allowance / 10**18:.2f} USD1\n")
else:
    print("❌ Not approved yet\n")

    # Step 2: Setup (approve relayer)
    print("Step 2: Approving relayer (one-time setup)...")
    print("This will cost a small amount of BNB for gas...")

    result = b402.setup("USD1", auto_approve=True)

    if result["tx_hash"]:
        print(f"✅ Approved!")
        print(f"TX: https://bscscan.com/tx/{result['tx_hash']}\n")
    else:
        print("✅ Already approved\n")

# Step 3: Send payment (gasless!)
print("Step 3: Sending payment (gasless)...")

payment = b402.pay(
    amount="0.01",
    token="USD1",
    recipient="0x96625c0e209b4e0d4741d8a3ffb6b91c0da6fa5f"
)

if payment.success:
    print(f"✅ Payment successful!")
    print(f"Paid: {payment.amount} {payment.token}")
    print(f"From: {payment.payer}")
    print(f"To: {payment.recipient}")
    print(f"TX: https://bscscan.com/tx/{payment.tx_hash}")
else:
    print(f"❌ Payment failed: {payment.error}")

print("\n=== Demo Complete ===")