Dear Dr Redfield,
Thank you for your reply.
A purchase order is for your benefit only, Elsevier do not require one, please see below link:
Elsevier accept 3 methods of payment, please see below link:
As previously advised your article can be made available via open access, however you must cover the cost of USD$3,000.
Please confirm if you wish to proceed, I will update our system and send the forms for invoicing.
Elsevier Support Person
The discovery of gravitational waves is the perfect opportunity for the Nobel Prize committee to change its rules
11 hours ago in The Curious Wavefunction