Stripe Temp

 $update = \Stripe\Subscription::update($subscriptionId, [
    'billing_cycle_anchor' => 'now',
    'proration_behavior' => 'always_invoice',
    'proration_date' => strtotime('tomorrow 00:01'),
    'default_tax_rates' => [$this->getCorrectTaxRateId($planID)],
    'cancel_at_period_end' => false,
    'items' => [
        [
            'id' => $subscription->items->data[0]->id,
            'plan' => $planID
        ],
    ],
    'coupon' => $coupon
]);