OTP code or One-Time Password is a one-time verification code or password consisting of a unique and secret 6 digit character (often a number) which is generally sent via SMS or e-mail. Each code that is sent is generally only valid for 5 minutes.
The OTP code also applies in the TrueMoney Indonesia application to maintain the security of your application. And don't tell the OTP Code to anyone.

More info:
Customer Service: 08.00 - 17.00 WIB (every day)
Telephone: 0804 1000 100
WhatsApp Chat: +62813 8003 3868
WhatsApp Call: +62878 7600 0969 (Especially for Money Transfer services)