Sorry, I thought I mentioned the project, my bad. It's name is Paymento (paymento.io), I found them on LinkedIn. I don't know if they're open-source but yeah it says that it does the way you described here. I think Paymento has a Buy Now Pay Later feature? either that or they're working on it for the future. here's the post on
LinkedIn: ~link snip~
I've done some research in the meantime, and apparently crypto payment gateways are custodial. I'm looking for a non-custodial options and wanted to know if even it is possible or not (I'm not very into the technicality of crypto, I just HODLed some in the recent years and now I want to integrate some gateways with my website, so I'm asking around)
After I checked on their documentation no, they don't have any open-source code. About the feature buy now and pay later feature you can also apply it in other crypto payment gateways as likely the same as subscriptions or if you are using woocommerce you can add this feature buy now pay later.
There's a list of hosted, non hosted, custodian and non-custodial payment gateway you can't find it easily on Google but if you search them here on the forum you should be able to find them.
Anyway, here's the list of payment gateway below.
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https://github.com/alexk111/awesome-bitcoin-payment-processors