Below is a link to an integration guide that will assist in providing you information on how to connect and update the Bp Premier Database (where applicable). You will need to connect to the database via an authorised SQL account, these details are provided on request and will depend on the type of integration and the level of access the integration requires.
There is no restful API, rather a direct database connection using SQL authentication to access / execute SQL Stored Procedures.
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A commercial agreement is required for certain types of write back access, the Stored Procedures that require an agreement have a token parameter.