protected function getSubscriptionPayload($customer, array $options = [])
    {
        $plan = BraintreeService::findPlan($this->plan);

        if ($this->skipTrial) {
            $trialDuration = 0;
        } else {
            $trialDuration = $this->trialDays ?: 0;
        }

        return array_merge([
            'planId' => $this->plan,
            'price' => number_format($plan->price * (1 + ($this->owner->taxPercentage() / 100)), 2, '.', ''),
            'paymentMethodToken' => $this->owner->paymentMethod()->token,
            'trialPeriod' => $this->trialDays && ! $this->skipTrial ? true : false,
            'trialDurationUnit' => 'day',
            'trialDuration' => $trialDuration,
        ], $options);
    }