You charge an electric van by plugging a powerline into its charging socket. The power can come from anywhere there is access to the power grid - including fast chargers at garages, home charging points & even 3-pin plug extension cables.
Most modern electric vans have a Type 2 charging port installed - this is the standard charging port in use across Europe. However, some newer electric vans have ports capable of using DC rapid charging.
In most cases, DC rapid charging will charge an electric van back to 80% in 30-60 minutes.