Add idempotency key to Stripe PaymentIntent creation#13
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Derives the key as `mpp-java_<challengeId>_<spt>` (matching the mppx TypeScript SDK pattern) so that replaying the same credential produces the same idempotency key and Stripe deduplicates the request. This prevents credential-replay attacks from creating multiple PaymentIntents against a single Shared Payment Token. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Committed-By-Agent: claude
ksn-stripe
approved these changes
Jun 29, 2026
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Derives the key as
mpp-java_<challengeId>_<spt>(matching the mppx TypeScript SDK pattern) so that replaying the same credential produces the same idempotency key and Stripe deduplicates the request. This prevents credential-replay attacks from creating multiple PaymentIntents against a single Shared Payment Token.