How to properly organize a fundraiser for product development?

Question

Crowdfunding

Hello.
The situation is as follows: there is a site on Wordpress with a presentation of the product and a call to pre-order it (in other words, to support the development), i.e. the user will end up with the product when it comes out. Not an online store. An affiliate system is also set up inside the site to encourage users to invite people to the site, but this is just a word.
The crux of the matter is fundraising. Given the above, how to properly and without problems organize fundraising directly on the site with a minimum of clicks for the end user, with universal payment methods (because it is planned to collect funds from abroad), while complying with all laws (individual, There is no individual entrepreneur or legal entity, but we will create it in the future if there is such a need) and, as they say, so that everything is "chiki-farts"? And with all this, it’s easy to embed it in Wordpress and automatically keep a record of pre-orders.
PS
Do not throw tomatoes at the site for the first time. The Internet studied in search of a solution, but did not come to the right one. I want to get acquainted with the experience of people who have experienced this. Thank you for understanding.