I need the iDeal payment method in Weebly. Since they don't offer it, I need to use a third party shopping cart - OpenCart 2.0. Can OpenCart be added to Weebly? I asked at Weebly and OpenCart before asking here.
If you have access to create a database, full access to database structure, FTP access into the server to mitigate files, permissions support (or other utils)...then Yes.
But I would assume the answer is "NO". I suggest just going for traditional hosting. There isnt really an advantage to using these cheesy web builders nowadays....the Open Source counterparts are usually much more robust/secure/flexible and you wont have to hack in workarounds like this to get a simple payment gateway working.