fixed fee direction

api/gateway/aurora/internal/service/provider/mask_test.go

@@ -0,0 +1,23 @@
+package provider
+
+import "testing"
+
+func TestMaskPAN(t *testing.T) {
+	cases := []struct {
+		input    string
+		expected string
+	}{
+		{input: "1234", expected: "****"},
+		{input: "1234567890", expected: "12******90"},
+		{input: "1234567890123456", expected: "123456******3456"},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.input, func(t *testing.T) {
+			got := MaskPAN(tc.input)
+			if got != tc.expected {
+				t.Fatalf("expected %q, got %q", tc.expected, got)
+			}
+		})
+	}
+}