PDF Viewer SDKAPI referencesPDF Viewer SDK API referenceTypesEnumerationsStampAnnotationSubtypeVersion: Version 5On this pageEnumeration: StampAnnotationSubtype An enum defining stamp annotation subtypes. Enumeration Members Custom Custom: 4 CustomText CustomText: 1 Image Image: 2 Pdf Pdf: 3 PredefinedText PredefinedText: 0 Undefined Undefined: 5