Proxy & Account Resolution Process

Note: Support for ISO 20022 acmt.023 and acmt.024

Nexus uses the ISO 20022 messages acmt.023 and acmt.024 for all communication related to proxy resolution or account resolution.

The remainder of this guide assumes that the IPS operator, proxy directory and member PSPs can support the acmt.023 & acmt.024 messages according to the Nexus usage guidelines. However, this is not the case in many countries.

IPSOs that do not currently support acmt.023 andacmt.024 must either:

• translate these messages to the relevant domestic format, or

• adapt their systems (including the proxy directory, and the systems of their member PSPs) to support these messages.

These options and the translation process are described in Messaging & Translation.

Simple Overview

The diagram below shows the proxy and account resolution process at a high level.

(The user experience in the app is shown in more detail (with visual examples) in Payment Setup).

Figure: Proxy & Account Resolution Flow Diagram (Simple Overview)

High level flow diagram showing the proxy and account resolution process in Nexus

1. A Sender can enter either the Recipient’s proxy ID or account ID into their PSP’s app

2. The Source PSP will send this information to Nexus

3. If the Sender provided a proxy, Nexus will connect to the relevant proxy directory and request the corresponding account details

   1. The proxy directory will return the corresponding account details.

4. If either (a) the Sender provided an account ID, or (b) the proxy resolution response from the Proxy Directory includes the account ID, Nexus will:

   1. Check if the Destination PSP is able to accept account resolution requests.

      1. If so, Nexus will send an account resolution request to the Destination PSP

5. Nexus will combine the information from the proxy directory and the Destination PSP (if an account resolution request was sent), and send this back to the Source PSP

6. The Source PSP will check the information in the response:

   1. If a Display Name was provided, the Source PSP will ask the Sender to confirm that the payee is who they expect

   2. If no Display Name is provided, the Sender will be advised to proceed with the payment at their own risk

   3. If no other information is provided (such as the full name on the account), then the Source PSP will need to ask the Sender to provide this information so that the Source PSP can perform compliance and sanctions screening checks on the Recipient.

The rest of this section covers those steps in more detail.