Account linkage services that connect bank accounts with external applications offer great convenience, but many users worry about security. To use account linkage safely, it is important to check several points in advance. This article explains safety checkpoints to verify before using account linkage services.

Verify Service Authorization

Before using an account linkage service, check whether it holds proper authorization. In Japan, businesses using bank APIs must be registered as Electronic Payment Processing Service Providers under the Banking Act. You can verify this through the Financial Services Agency’s registered business list.

The authentication method used is also important. Financial APIs should use FAPI-compliant OAuth 2.0 authentication, and services supporting this standard can be considered higher security.

Understand Data Handling Scope

When using account linkage services, understand what data is accessed and how it is used. Check the service’s terms of use and privacy policy for data acquisition scope, retention periods, and whether data is shared with third parties.

The distinction between read-only and write access is particularly important. For balance inquiries only, read-only APIs should be used. APIs capable of fund transfers should not be necessary.

Two-Factor Authentication Support

Check whether the account linkage service supports two-factor authentication. With two-factor authentication enabled, even if a password is compromised, unauthorized access is prevented without the additional authentication factor.

Many financial institutions require two-factor authentication when setting up account linkage or performing important operations. Choose services that implement such security measures.

Confirm Disconnection Method

Before starting account linkage, also confirm how to disconnect it. Avoid services where disconnection is impossible or the procedure is overly complex. Ideally, you should be able to disconnect from the service’s settings screen, and the financial institution should also allow you to view and cancel linked services.

Also check what happens to already acquired data when linkage is terminated. Unnecessary data should be properly deleted.

Conclusion

To use account linkage services safely, verify the provider’s authorization, data handling scope, two-factor authentication availability, and ease of disconnection in advance. Keeping these checkpoints in mind allows you to enjoy the convenience of account linkage with peace of mind.