I just tried to make a real payment using the Stripe plugin (not Stripe connect). 
The payment was made (the money was transferred), but after the payment on the screen I read "Stripe connect not configured" and then the following errors:
Page: /undefined
404
Page not found
Call stack
#	Function	Location
1	()	JROOT/libraries/legacy/error/error.php:200
2	JError::raise()	JROOT/libraries/legacy/error/error.php:277
3	JError::raiseError()	JROOT/components/com_sppagebuilder/controller.php:35
4	SppagebuilderController->display()	JROOT/libraries/src/MVC/Controller/BaseController.php:710
5	Joomla\CMS\MVC\Controller\BaseController->execute()	JROOT/components/com_sppagebuilder/sppagebuilder.php:24
6	require_once()	JROOT/libraries/src/Component/ComponentHelper.php:402
7	Joomla\CMS\Component\ComponentHelper::executeComponent()	JROOT/libraries/src/Component/ComponentHelper.php:377
8	Joomla\CMS\Component\ComponentHelper::renderComponent()	JROOT/libraries/src/Application/SiteApplication.php:194
9	Joomla\CMS\Application\SiteApplication->dispatch()	JROOT/libraries/src/Application/SiteApplication.php:233
10	Joomla\CMS\Application\SiteApplication->doExecute()	JROOT/libraries/src/Application/CMSApplication.php:196
11	Joomla\CMS\Application\CMSApplication->execute()	JROOT/index.php:49
I remember that both "Stripe" and "Stripe connect" are installed on my site (but Stripe connect is disabled and not configured)