(CNN) -

Who'd be a referee? When the crowd aren't getting on your back you've got the players acting up or giving you an earful.

So if someone described your refereeing as "the best," you could be forgiven for feeling a small surge of pride. But when the person praising you has been called the world's most notorious match fixer, then it's time to show yourself a red card.

Wilson Raj Perumal says he corrupted many football players and officials during a long criminal career, but there is one person who stands out from the crowd. His name was Ibrahim Chaibou, a referee from Niger.

"He was the best, he was the best, but not from FIFA's point of view," Perumal told CNN during a wide-ranging television interview about his match-fixing days.

Perfect partner

The Singaporean, who is now helping European police with match-fixing investigations, claims to have rigged the results of up to 100 matches over a 20-year period, boasting of a 70-80% success rate.

Chaibou, who he describes as "very bold," became one of his favourite match officials.

According to Perumal, the referee's first match fix was an international friendly between South Africa and Guatemala in May 2010 -- one of several warm-up matches played ahead of the 2010 World Cup which the Rainbow Nation hosted.

Watching highlights of the game on YouTube, Perumal gives a running commentary on the major incidents.

"It's crazy," Perumal says as Chaibou awards South Africa a penalty kick. The quality of the footage is poor, but the fixer knows what happened.

"This is not a penalty. The offence took place outside the box," he says.

The man from Niger is allegedly at it again in the second half, this time awarding Guatemala a penalty for a handball. Replays show the ball striking a South African player's chest.

Chaibou awarded three penalties in all during the match and, according to Perumal, fulfilled his task of overseeing a high-scoring fixture. The game finished 5-0 to South Africa.

"We paid him very good money," Perumal says.

Elaborate scheme

Perumal says getting Chaibou onto the pitch was the result of an elaborate scheme where the match-fixer used his now-defunct company 'Football 4 U International' to target the South African Football Association (SAFA).

"I had this idea to influence the warm-up games without the knowledge of the association concerned.

"So I remember writing a formal letter to the association requesting that my company 'Football 4 U' supply referees from Africa at our expense," Perumal explains.

Supplying referees in this way is a breach of FIFA rules, but Perumal's idea was accepted.

"It is clear that the convicted criminal and football match-fixer, Wilson Raj Perumal, was involved in convincing SAFA to agree to a company then managed by him [Football4U] to select, fund and appoint referees," said a FIFA statement in March 2012.

FIFA also had act over a mini tournament in Antalya, Turkey in February 2011.

Fixers at an Asian-based syndicate approached the Football Associations of Bolivia, Bulgaria, Latvia and Estonia inviting them to an all-expenses paid event. But they were all duped, because the referees had allegedly been paid to fix the results.

Terry Steans, a FIFA investigator between 2010 and 2012, recalls the set up.

"It involved four international teams and an empty stadium, no ticket sales and yet the game was (open) for betting," Steans explains.

"I sat and watched match fixers with a briefcase full of cash to pay the referees."