If you need an OpenAPI method for creating websites on wildcard domains you need to install this hotfix. In other case when you already have installed OA 7.0.0 HOTFIX 129285 Apache v1, you also need to install the current hotfix. The previous hotfix has a broken behaviour with wildcard websites adding, if subdomain of target domain already created.
The new OpenAPI method was added and described in documentation. This method is allowed to create a wildcard website for some domain over OpenAPI call. The previous implementation did not correct resolve the domain to which the wildcard website is created.
This hotfix can be downloaded from here.
Use pa_updates_installer KB111323 to install this hotfix. Also this hotfix will be installed automatically during upgrade to OA 7.0 via pa_updates_installer.