Tollstile vs MPP SDKs

MPP is payment-method agnostic: one protocol for stablecoins, cards through Stripe, and sessions. If MPP is the only protocol you will accept, its SDK covers the wire format — challenges, credentials, and receipts.

What Tollstile adds

• Merchant lifecycle across protocols: access policies, requirements, a ledger, and reconciliation that work the same for MPP, x402, and others.
• Correct timing per method: Stripe charges capture at verification, so Tollstile uses the upfront flow and refunds when your handler fails; Tempo sessions use reusable authorizations drawn down per call.
• Replay protection beyond the challenge HMAC, which does not prevent reuse by itself.
• Recovering timed-out charges by looking them up instead of failing the request or charging again.