B2B Assist for Users help site has information pertaining to all components that support the B2B Payments On-Demand Payment and Tokenization Services. It is for end users of the B2B Payments On-Demand services. It explains the various components and how to use them.

https://paymetric.info/xiassist

If asked for login credentials, use the following:

username: pmclient
password: help@paymetric