You can purchase a Font License for yourself or on behalf of a client, such as when working as an external designer. However, the License must be owned by the end user—the person or entity for whom the Licensed Fonts will be used. This must be specified as the "Licensee" during checkout.
The Licensed Fonts can only be used for the client specified as the Licensee. You cannot use the Fonts for any other clients or purposes beyond what is covered by the License.