fix(webhook): preserve data.id case in signature manifest#142
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danielalfarourrea wants to merge 2 commits into
Open
fix(webhook): preserve data.id case in signature manifest#142danielalfarourrea wants to merge 2 commits into
danielalfarourrea wants to merge 2 commits into
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The manifest was lowercasing data_id before computing the HMAC, but MercadoPago signs the notification using the original casing. This caused signature validation to fail whenever data.id contained uppercase letters.
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Problem
WebhookSignatureValidator.validatewas calling.downcaseondata_idbefore building the HMAC manifest. MercadoPago signs webhook notifications using the original casing ofdata.id, so any notification with uppercase or mixed-case identifiers would fail validation withSignatureMismatch.Fix
Remove the
.downcasecall inbuild_manifestso the value is included exactly as received.Testing
Verified manually with
data.idvalues in uppercase (ORDER123), lowercase (order123), and mixed case (oRdEr) — all pass when the signature was generated with the same casing.