Yes, initiating participants - known as Originating Financial Institutions (OFIs) can adopt a percentage-based traffic split when migrating to the Modernised API. For example, an OFI may choose to route 60% of traffic via TCP/IP and 40% via the Modernised API (API v3). However, receiving participants - Receiving Financial Institutions (RFIs) must fully migrate to the Modernised API for a specific transaction code. This means 100% of traffic for that transaction must be routed through API v3. Switching Connectivity
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