Hello,
Please open your browser web console (ctrl+shit+i OR F12) in order to see if you have any JavaScript error or a message from the Stripe JS Library.
The message "STRIPE_PLEASE_WAIT" is mostly an error with the JS which block the script processing and do not finish the loading of Stripe Elements.
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.