The Woocommerce settings work, thanks.
This is the error it gives:
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
2load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:4 POST https://testserver.local/wp-admin/admin-ajax.php 500 (Internal Server Error)
send @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:4
ajax @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:4
n.(anonymous function) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:4
addLineItemToOrder @ wc-phone-orders.js?ver=4.9.6:278
onSelectItem @ wc-phone-orders.js?ver=4.9.6:383
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3
trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3
a.event.trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:9
(anonymous) @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3
each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:2
each @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:2
trigger @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3
(anonymous) @ select2.full.min.js?ver=4.9.6:1
d.invoke @ select2.full.min.js?ver=4.9.6:1
d.trigger @ select2.full.min.js?ver=4.9.6:1
e.trigger @ select2.full.min.js?ver=4.9.6:2
(anonymous) @ select2.full.min.js?ver=4.9.6:2
d.invoke @ select2.full.min.js?ver=4.9.6:1
d.trigger @ select2.full.min.js?ver=4.9.6:1
(anonymous) @ select2.full.min.js?ver=4.9.6:1
dispatch @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3
r.handle @ load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils&ver=4.9.6:3