Introduction

This article provides guidance for resolving Reason Code 150 with the message:

“The following request field(s) is either invalid or missing: terminal_id.”

This error occurs when processing domestic debit transactions in Thailand that must be routed through the National ITMX network, as required by the Bank of Thailand. It typically results from missing or invalid ITMX Merchant ID (MID) or ITMX Terminal ID (TID) information.

Overview

Effective 2 July 2021, the Bank of Thailand requires all domestic debit transactions in Thailand to be routed through the National ITMX connection.

• Credit card transactions continue to be processed through Visa Platform Connect (VPC).
• Domestic debit transactions must be processed in-country via ITMX.

During merchant onboarding, both VPC and ITMX must be selected as processors to ensure correct routing of domestic debit transactions.

Procedure: Resolving Reason Code 150

Follow these steps to correct the issue and process transactions successfully.

Step 1 – Confirm Processor Selection

• Ensure that both VPC and ITMX are selected as processors during merchant onboarding.

Step 2 – Verify Required ITMX Fields

Confirm that the merchant profile contains valid entries for all required ITMX fields:

Required Field	Description
ITMX Merchant ID (MID)	Unique identifier for the merchant in ITMX
ITMX Terminal ID (TID)	Unique identifier for the terminal in ITMX
ITMX Acquirer BIN	Bank Identification Number for the acquiring bank

Step 3 – Correct Missing or Invalid TID

1. Verify that the ITMX Terminal ID (TID) is entered correctly in the transaction request.
2. If the TID is missing or incorrect, update the merchant profile with the correct MID and TID.
3. Resubmit the transaction.

Tip: Domestic debit transactions will fail if any ITMX-required field is missing or invalid. Confirm these values before processing or resubmitting.