Fixes + stable gateway ids

api/pkg/discovery/gatewayid.go

@@ -0,0 +1,27 @@
+package discovery
+
+import "strings"
+
+// StableGatewayID composes a stable discovery entry ID from a base prefix and key.
+func StableGatewayID(prefix string, key string) string {
+	cleanPrefix := strings.ToLower(strings.TrimSpace(prefix))
+	cleanKey := strings.ToLower(strings.TrimSpace(key))
+	if cleanKey == "" {
+		cleanKey = "unknown"
+	}
+	if cleanPrefix == "" {
+		return cleanKey
+	}
+	if strings.HasSuffix(cleanPrefix, "_") {
+		return cleanPrefix + cleanKey
+	}
+	return cleanPrefix + "_" + cleanKey
+}
+
+func StableCryptoRailGatewayID(network string) string {
+	return StableGatewayID("crypto_rail_gateway", network)
+}
+
+func StablePaymentGatewayID(rail string) string {
+	return StableGatewayID("payment_gateway", rail)
+}