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In March 2019 the European Commission announced that the EWP standards will be mandatory from the beginning of the new Erasmus Programme in January 2021. The timetable they put forward was: 
    2021: Online learning agreements
    2022: Inter-institutional agreements
    2023: Nominations and Transcripts of records

In practice there are 3 ways to do this:
A HEI implements the APIs itself
A HEI uses a third party software tool
A HEI uses the EWP/Erasmus Dashboard

A combination is possible, but you cannot combine tools for the same API service  (e.g. usin,g the Dashboard AND commercial software simultaneouslty for Learning agreements)  

In practice, this means that HEIs can gradually introduce the changes, even though the EWP Network already has operational APIs for all of the processes in student exchanges as we speak. For a detailed description of the EWP APIs click here. Our third-party provider EWP partners (Mobility Online (AT), MoveON (UK), USOS (PL), Cineca (IT), Sigma (ES), FS (No)), have committed to implement all APIs in their business development plan, but the exact timetable is, of course, their own responsibility.  
Finally, the EWP/Erasmus Dashboard will be fully EWP compatible as of early 2021.

You could also start with one solution for a particular API  service and later on change to another one, as long as you don't use two solutions for the same service at the same time. 

The functionality of the EWP Network is defined by its APIs (Application Programming Interfaces), i.e. services (specified in the GitHub platform) which can be used by network participants to exchange data. Each API specifies how to connect to the EWP Network for a specific purpose. There are APIs to identify HEIs and others to create and exchange Nominations, Interinstitutional Agreements, Learning Agreements, Courses, Transcript of Records and many more. New APIs (with new services)  can be added to the EWP Network at any time. A summary and description of the EWP APIs can be found here. 

EWP and the Mobility Tool+ (MT+)  team have been working to connect the EWP Network to the MT+. At present specifications have been developed and agreed upon and basic connectivity realised; furthermore, the University of Porto created a network node for the exclusive usage of MT+. This network node will handle all the security and verification steps pertaining to requests made from the EWP Network directed to the MT+, and ensure the connection with their servers. The node also handles responses from the MT+ servers and ensures their accurate delivery to the relevant node in the EWP network. Furthermore, three relatively simple APIs, for reading data from the tool were designed, tested and posted in the PROD Network. The more important APIs -  for the automatic reporting of the mobility data - are still being developed and tested by the involved technical teams.