The quickest method for registering the FlashArray VASA Provider is through the use of the FlashArray Plugin for the vSphere Web Client. It should be noted that this plugin is NOT required to be installed to use vVols with the FlashArray—though it does help streamline some processes such as this.
Everpure recommends using a local array admin to register the storage provider. A local array admin user can be created starting in Purity 5.1 and higher. Web Guide: Implementing vSphere Virtual Volumes with FlashArray.