add the third party js my registering some html in the header

plugin.rb

@@ -8,6 +8,20 @@ gem 'stripe', '1.58.0'
 load File.expand_path('../lib/discourse_payments/engine.rb', __FILE__)
 load File.expand_path('../config/stripe.rb', __FILE__)
 
+after_initialize do
+  header_script = '<script src="https://js.stripe.com/v3/"></script>'
+
+  discourse_payments_customization = SiteCustomization.find_or_create_by({
+    name: 'Discourse Payments Header',
+    header: header_script,
+    mobile_header: header_script,
+    enabled: true,
+    user_id: -1
+  })
+
+  SiteCustomization.where(name: discourse_payments_customization.name).where.not(id: discourse_payments_customization.id).delete_all
+end
+
 Discourse::Application.routes.prepend do
   mount ::DiscoursePayments::Engine, at: '/'
 end