Hello,
The plugin do load the stripe.js file with the right URL and parameter.
$doc->addScript('https://js.stripe.com/v3/');
Do you have a template or system plugin which could alter that ?
Without having a look at your website, it will be very difficult to tell you more.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.