Agency agreement amazon.co.uk - commission and vat issue

The situation is as follows:
I am UK based sole trader who have got business account on amazon.co.uk. I signed an agency agreement with EU based company and started selling some goods for that company recently. We are both VAT registered. All disbursements from amazon.co.uk go directly to my principal’s bank account. My duty is only dealing with returns etc, every 14 days I send them an invoice regarding my commission and they transfer specified amount of money to my bank account. The question is – can I issue invoices for the customers buying products from my amazon account? I am afraid if I issued any invoice for customers HMRC would see me responsible for paying VAT on turnover .
The principal would like to be undisclosed. In these circumstances I am not sure how to deal with it.
Is ther anyone who could clarify my doubts? I appreciate any help.
Privacy Policy