Stripe payment popup window

I am using the Coupon theme with the Ultimate Membership Pro and the Stripe plugins.

Based on discussions in the forum https://www.premiumpress.com/forums/topic/payment-gateway-stripe/page/1/ and the Stripe API documentation have I made the following amendments to my wlt_gateway_stripe.php file :

data-label=”Monthly fee”
data-name=”My website name”
data_description=”The first 30 days are free, hereafter you will be charged 3$ per month.”
data-email=”my@email.com”
data-allow-remember-me=FALSE

I have deactivated the plugin, reactivated it again, deleted all browser history, and still none of these amendments occur in the Stipe popup payment window ?

Does anybody have an idea of what I miss ?

Br, Jacob