Harlem Simiona and Grover Harmon put the home side 2-0 up inside the opening 20 minutes.
Federico Diaz pulled a goal back for the Samoan champions from the penalty spot before Tyrell Barringer-Tahiri restored his side's two goal cushion in the 27th minute.
Kiwi FC were reduced to nine men for the final 20 minutes of the match, following the dismissal of Falaniko Nanumea and Andrew Setefano, with Ben Mata wrapping up a comfortable victory for the hosts from the penalty spot.
Tupapa coach Delenay Yaqona was thrilled with the home team's performance.