It looks like the brand owner L'Oréal handle their own distribution so hopefully your invoice is from L'Oréal (UK) Limited or at least L'Oréal in Europe.

In fairness L'Oréal (UK) Limited publish their General Terms Of Sale on their website so you can easily see what you'll need.

One restriction is: "In no circumstances can Products be exported except within the countries in the European Economic Area, United Kingdom, Switzerland, Channel Islands or Isle of Man without the prior written approval of Seller." so the products will need to be sourced directly from L'Oréal in Europe or the UK.

They also clearly state they operate a "Selective Distribution Agreement" with a “Selective Internet Addendum” so you'll need a letter of approval signed by L'Oréal and yourself to sell their products on Amazon or any other website. The policy definitions are:

"Selective Distribution Agreement" means a contract agreed and signed between Seller and Customer that accepts Customer into Seller's selective distribution system and allows Customer to purchase Selective Products, including any Selective Internet Addendum.

“Selective Internet Addendum” means an addendum to a Selective Distribution Agreement agreed and signed between Seller and Customer that provides specific approval for Customer to sell Selective Products on a specified website address on the internet.