Gocoin.com, they provide extensions for almost all major CMS.You can accept bitcoin,litecoin, and dash.
Whenever a client wants to accept altcoins, I use this.Never had a problem, but some of their extensions are old and haven't received any update for over 3 years.
You can also try selly's extension
https://github.com/Selly/selly-woocommerceIf your website is build on wordpress.
Or you can use their API.
Good luck!
Hey, thanks a lot for the reply!
Unfortunately I need an API with more alt coin options, such as DECRED, MONERO, BITCOINCASH, DOGE, etc.
I'm also thinking of a way to use my computer as a wallet and let the website access it and do what is needed, but I don't know how hard that would be.