Information about account set up for intermediary access is available here.
Each Power User (API user) is able to have up to 10 connections across both direct and intermediary access means, with the ability to facilitate multiple intermediaries.
Each end user seeking access to the DSB’s Production services will need to have contracted directly with the DSB.
Intermediaries connecting to the DSB for ISIN creation and/or API based search will need to execute a user agreement, but may not be required to pay fees unless the intermediary is also acting as a Power User themselves
Full legal documentation (agreement and policies) are available here.