API Integration eCommerce Store

Hi There,
We are an eCommerce company who specialise in personalised products. Through multiple niche websites we offer an array of products from personalised gifts to condolence books to corporate glassware.

I have a job and that's to integrate one of our eCommerce websites (on a Big Commerce platform) that is currently in development to a personalisation platform (Custom Gateway). enabling customers to view live personalisation previews on product pages using smartlinks and via API orders links to their management system for ease of use for our personalisation team.

We would like the API work undertaken on this development site, but further down the line undertake this on a second website and a third.

If you require more information to quote do get in touch and I can hopefully provide it for you.
A budget is not something I can set as unsure how long the job could take so please provide a competitive quote.

Sarah