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Webflow Affiliate Program as Freelancer

Hi guys,
hope you all are well and healthy.

I struggle a bit with the webflow affiliate program:

I am planning to work as a freelancer to design webpages for small and medium sized companies in my area.

So I planned to use the Client billing tool, to provide an easy service for my customers so that they don´t need to commission their own hosting plan but instead I will provide them with this service.

For my understanding (if I am correct): the client will not go on webflow via my affiliate link, as I will provide that service for them via client billing.
So I wonder, how to participate in the affiliate program as none of my clients will use the affiliate link.
So I am asking myself how to participate in the program when using client billing?
Or do I misunderstand the client billing function?

Thanks to anybody that can clarify!