No, the Modernised API (API v3) is not backward compatible with existing connectivity channels. Both new and existing participants will need to develop and integrate with the new API framework.

To support a smooth transition:

• The Modernised API can co-exist with existing connectivity during the migration period.

• Participants may choose to operate both versions in parallel until full migration is completed.

Estimated Integration Effort (based on pilot feedback):

• Network Administration (NA), National Addressing Database (NAD), DuitNow Transfer: ~1 month (for first-time integration)

• DuitNow QR MPM Domestic: ~2 weeks (for service enablement)

Please note: Timelines may vary depending on your internal architecture, resources, and readiness.