Definitely recommend Certifeurope :)
After searching through various options available on the internet for getting an eIDAS (signature électronique avancée) signature for my INPI document, I came across this Certifeurope website and got my signed document within 15 minutes. I paid 36 Euro which I found less expensive than the other options available in the market, i.e., docusign paid version or goodflag or other listed companies on french gov websites. Since I needed only a document signed, the other subscription-based options were not suitable for me. The process of getting a signed doc on CertifEurope is easy, simple and more economical, especially for a foreigner. They are active and very prompt in replying to your queries by phone and email. I was doubtful in the beginning whether this is authentic or not, so I wrote an email to them, and they replied to me quite promptly and clarified my doubts. Definitely recommend Certifeurope. :)