Installments are one of those things that seem basic but are actually rather tricky on the back end, because they require automated billing. That sounds simple too, but it’s like… well… okay, so you give a mouse a cookie, right? If you give a mouse a cookie, they’re gonna want a glass of milk. But if you give them a glass of milk, they’re going to want to store your credit card information.
You can’t charge a card automatically unless you have the card info in a secure database for later use. You’d also need an “account” for the customer, so the system can tell whose card is whose, which transactions are which, and when to terminate the installments. Unfortunately, Webflow doesn’t have that infrastructure available to the end user just yet.
To be clear, this is 100% possible in Webflow, but not without some outside help. You can integrate with Shopify quite easily using their Buy Button toolkit, for example. I don’t know for sure, but there’s gotta be something for installments with Shopify.
If you’re interested in going that route shoot me a message and I’ll be glad to help!