Visit the official OTR registration portal for your country or state
Create an account using your email or mobile number
Log in to the portal
Complete the registration form with your personal or business details
Submit the required identification documents
Verify your email, phone number, or identity if prompted
Save or download the confirmation page or registration certificate
Check your registered email or portal dashboard for the OTR number
Contact the relevant tax or registration authority if you cannot find it
Use the official helpline or support center for retrieval assistance