Getting a publication onto LinketySplit is a handful of steps, and none of them require any custom development up front.
Sign in at LinketySplit with your email address — see Signing in to LinketySplit. The same account you use to buy articles elsewhere works here; there's no separate publisher signup.
From your account, create a publication record: its name, its home page URL, and who on your team should have access to its dashboard. Everything below — domains, pricing, API keys — lives under that publication, in its own dashboard.
Add the domain your articles live on and verify you control it. LinketySplit needs a verified domain before it will sell access to anything published there. See Pricing and connecting your domain.
Decide what a locked article costs — a single price, or a price with a discount for readers buying several copies at once. Also covered in Pricing and connecting your domain.
Your site needs a way to ask LinketySplit for a purchase link and to know when a reader has actually paid. That's what the API key in your publication's settings is for — see Using the API and SDK for how to wire it up.
Once those five pieces are in place, any locked article on your site can point a reader at a real LinketySplit purchase page.