Indonesian embassy officials met the 25-year-old on February 25 in Kuala Lumpur.
Siti Aisyah said she was given the cash to smear Kim Jong-nam’s face with “baby oil” as part of a reality show joke.
Tests show the half brother of North Korean leader Kim Jong-un was killed with the highly toxic nerve agent VX.
VX is classified as a weapon of mass destruction by the United Nations.
Kim Jong-nam died on February 13 after two women accosted him briefly in a check-in hall at Kuala Lumpur international airport.
Malaysian police have said that a sweep of the airport for toxic chemicals by a forensic team, the fire department and the Atomic Energy Licensing Board will take place from 01:00 on February 26.
There is widespread suspicion that North Korea was behind the attack, which it strongly denies.
A Vietnamese woman and a North Korean man have also been arrested in connection with the assassination of Kim Jong-nam. At least seven other suspects are wanted by police.
After a 30-minute meeting with Siti Aisyah on February 25, Indonesian Deputy Ambassador Andreano Erwin said: “She only said in general that somebody asked her to do this activity. She only said in general she met with some people who looked Japanese or Korean.
“According to her, that person gave her 400 ringgits to do this activity… She only said she was given a kind of oil, like baby oil.”
The officials said they did not see any physical signs that the suspect had been affected by the chemical.
Vietnamese officials also met their arrested national, Doan Thi Huong, 28, but made no comment.
Malaysia’s police chief Khalid Abu Bakar said on February 24 that the presence of the nerve agent had been detected in swabs taken from Kim Jong-nam’s eyes and face.
Kim Jong-nam had sought medical help at the airport, saying someone had splashed or sprayed him with liquid. He then had a seizure and died on the way to hospital.
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