Michaela Foster's early corner for WaiBOP caused havoc for the defending champions and allowed WaiBOP to take the early lead.
Whitney Hepburn struck back from a stunning long-range strike for Canterbury that rattled off the underside of the bar, before Britney-Lee Nicholson tucked home a header after being left unmarked in the box from an in-swinging cross.
Twice WaiBOP could have found themselves either level or ahead after Kelli Brown found the back of the net - but was ruled offside - and later on a scramble in the Canterbury box nearly secured another goal for WaiBOP.
WaiBOP would find a second strike to pull the game back to 3-2 after Lisa Evans squared a ball for Chelsea Elliot to tap home.
Canterbury would eventually secure the win after a late penalty was given and Rebecca Lake sent Rylee Godbold the wrong way to secure a 4-2 win for the travelling side.
In the men's league, Hamilton Wanderers started their campaign with a stunning second half after a familiar face came back to haunt Hawke's Bay United.
Josh Signey, who made the move north to Wanderers earlier this year, netted two of his side's three second-half goals in a comprehensive 3-0 victory at Bluewater Stadium, Napier, on Sunday.
Derek Tieku, a former Crystal Palace and Fulham youth prospect, grabbed his side's third and final goal of the day in the 85th minute as the home side looked to get back into the game.
- Additional reporting Hawkes Bay Today