Information Technology and Control

I don't know about others, but if there are classmates who are in the same situation, we can gather downstairs and discuss it:
1. Starting at the end of March, the official website process has been continuously under review (with no review comments, just several rounds of editing).
2. On April 20th, I received an email suddenly informing me that my paper will be published in June (but there was no formal acceptance notification), and then they asked me to transfer 500 euros as a "publication processing fee" to their bank account stated on the official website.
3. I sent emails on April 21st and 25th to inquire about the situation. On May 4th, I received a reply stating that after paying the 500 euros, the paper will enter the "copyediting" stage. I'm a bit confused because they previously mentioned publication, and now they are talking about copyediting.
4. Today, May 5th, I went to the bank counter and paid 500 euros, along with a service fee of 200 RMB (Bank of China) and 25 euros (the other party's bank). Now, let's see if it will be published in June.

I will update the comments section if there are any further developments.

Follow-up 2:
1. In early May, I submitted the invoice form on the official website (I was anxious, so I submitted it 3 times and also sent an additional email), but they will only send the invoice via email on June 6th. So, after submitting the form once, I should wait until next month to receive the invoice. Unlike other journals, they cannot issue the invoice immediately after PayPal payment.
2. On June 17th, they sent me the final confirmation letter and asked me to fill out the author's declaration (to guarantee that the paper has not been published in any other journal) and also confirm if there are any issues with the final version of the paper submitted on May 11th. They requested that I send them back within 3 days to the editorial department.