Printfil Registration Code Review

String requestBody = mapper.writeValueAsString( java.util.Map.of("registration_code", REG_CODE) );

1. What Is a “printfil” Registration Code? The term printfil is most commonly encountered in two distinct contexts: printfil registration code

public static void main(String[] args) throws Exception HttpClient client = HttpClient.newHttpClient(); ObjectMapper mapper = new ObjectMapper(); String requestBody = mapper