No, they will not need to have API capability for digital phase one release. Messages using the existing batch EDI file transfer protocols into your PAS will still be available. However, EDI files will be delivered through the new gateway risk service, or market gateway (ASG Adept).
Both will need to be switched over for phase one, however during phase two they can be moved across at different times. If your PAS systems operate completely independent from each other this shouldn't be a problem, however if you do try to combine the data then you'll need to factor this into your phase two planning.
We do not currently have the URLs for the portal/s, these will be confirmed in good time ahead of changeover.
The main change is a new gateway risk service, or market gateway- it will be delivered via the new ASG Adept gateway in phase two.