Normaly you can integrate any payment system on your Wix-Site.
II don’t know how the Checl-OutPage is structured and what kind of elements are given on this page (and if these are editable), but at least it should be possible to generate your wished function by using a custom element.
Questions you should ask yourself…
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What kind of date do i need/want to transfer on a payment?
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Which security-risks i will have to face ?
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Am i able to modify Check-out-page, or do i have to generte my own Check-Out-Page?
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Are there even more posibilities i can use?
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What about a HTML-Component (how secure is it) ???
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How i can improve security ???
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What about Wix-Secret ???
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What kind of code-part i can put onto FRONT-END???
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What kind of code i can put on backend???
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…and so on, and so on…
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Am i really able to get this done without a professional code?
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Do i want to face all consequences, if my code is not secure at the end???
You should do first a good BRAINSTORMING → before you start to code a PAYMENT-GATEWAY / PAYMENT-SYSTEM / PAYMENT.
Good luck!!!