I will send you an email or send your article online to prepare for employment, and then send you a paper or an attachment. I will write down what articles you hired in the name of the magazine, your name and the title of the article, as well as the page fee and address you have to pay, and I will also indicate some places where your article needs to be revised. You can remit money after receiving this. It is not an advertising company that claims to be responsible for soliciting contributions for the magazine's governing unit. The email address you sent may not be official, but the agent's intermediary. Second, the page fee of general core journals is rarely so high. So I'm not sure if you're really hired.