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ahh, you will need to add a credits system, you can use myCred, I explained this in another video and here in my blog.
https://learnwithhasan.com/blog/saas-on-wordpress/
if you are asking where on my website, it is on PromoterKit, not here. and am currently updating the whole system, so the purchase option is not available this period, it will be back soon with more APIs and updates