public function enqueueStripeLibs()
    {
        if (($data = $this->didEnqueueLibs(__METHOD__))) {
            return $data; // Did this already.
        } // We only need to enqueue once.

        $data = [
            'scripts' => [
                'stripe' => [
                    'sri' => '', // No SRI, updated by Stripe.
                    'url' => '//checkout.stripe.com/checkout.js',
                ],
            ],
        ];
        return $this->enqueueLibs(__METHOD__, $data);
    }