Here are some basic modules for any site!
Grid field bulk editing tools – https://github.com/colymba/GridFieldBulkEditingTools
Sortable grid field – https://github.com/UndefinedOffset/SortableGridField
Also you need to install Payment 3.0 – https://github.com/silverstripe-labs/silverstripe-payment/archive/master.zip
It was included in 2.3 and 2.4 but now you must use module: