Introduction to the Boarding Registration Service {#boarding-intro-overview}
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Boarding Registration streamlines and automates the boarding of merchant accounts using the `Visa Acceptance Solutions` `REST API`. You can create a simple or complex hierarchy of accounts that represents merchant business units, and configure payment products for those accounts. To understand accounts, organizations, their hierarchy, and status, see these topics:

* [Understanding Accounts and Organizations](/docs/vas/en-us/boarding/developer/all/rest/boarding/boarding-intro-overview/boarding-intro-organizations.md "")
* [Extending the Hierarchy](/docs/vas/en-us/boarding/developer/all/rest/boarding/boarding-extend-hierarchy.md "")