fix(parsing): reject Payment-Receipt with a non-success status

src/main/java/com/stripe/mpp/Parsing.java

@@ -172,6 +172,7 @@ static Receipt parsePaymentReceipt(String header) {
 
         String status = str(map, "status");
         if (status == null) throw new ParseException("Missing status");
+        if (!"success".equals(status)) throw new ParseException("Invalid receipt status: " + status);
 
         String timestampStr = str(map, "timestamp");
         if (timestampStr == null) throw new ParseException("Missing timestamp");

src/test/java/com/stripe/mpp/ParsingTest.java

@@ -354,6 +354,23 @@ void receiptParseRejectsMissingMethod() {
             .hasMessageContaining("method");
     }
 
+    @Test
+    void receiptParseRejectsNonSuccessStatus() {
+        // Regression test for AGR-2026-086: an otherwise well-formed receipt
+        // whose status is anything other than "success" (e.g. "failed", as a
+        // malicious or buggy server might send) must be rejected, not parsed
+        // into a usable Receipt. status presence alone was previously
+        // sufficient; canonical mppx requires the literal value "success".
+        String header = ChallengeId.b64urlEncode(
+            "{\"method\":\"tempo\",\"reference\":\"ref-123\",\"status\":\"failed\","
+                + "\"timestamp\":\"2025-01-01T12:00:00Z\"}"
+        );
+
+        assertThatThrownBy(() -> Receipt.fromPaymentReceipt(header))
+            .isInstanceOf(com.stripe.mpp.error.ParseException.class)
+            .hasMessageContaining("status");
+    }
+
     @Test
     void receiptParseRejectsInvalidMethodId() {
         String header = ChallengeId.b64urlEncode(