Both English Wikipedia policy and the Wikimedia Foundation's terms of use require any paid editors to disclose on Wikipedia who is paying them, who the client is, and any other relevant role or relationship. It's a rule often broken, and enforcing it is fraught with practical difficulties.
Wikimedia Foundation Legal Counsel Stephen LaPorte: “It is not a violation of the Wikimedia privacy policy for editors to post links to public information about other editors ... It's up to community consensus here to decide when the harassment policy should allow editors to reasonably link to public information on other sites.”
Dealing with undisclosed paid editors is a Sisyphean and often invidious task for Wikipedia volunteers.
Professor Taner Akçam, falsely branded a terrorist in Wikipedia ten years ago
All Blacks coach Steve Hansen doesn't think much of Wikipedia's reliability, and for a good reason. Wikipedia has tens, perhaps hundreds of thousands of biographies of sportspeople, and they are both prone to vandalism (see the 1 July article in Fansided for another example illustrating the problem) and often not very diligently watched. Caveat lector.