The domain name is an important asset of a modern enterprise. It is a reflection of the brand and the place online where the shop can be found. Over the years, your store becomes bigger and the domain name represents a part of that value. This is because people remember the name (url), but also because you will collect links to the domain of your web store, which will heavily support its findability in the search engines like Google and Yahoo. Does your web store rank high in Google on the main keywords of your business? This will provide you with loads of (free and) relevant traffic: A very valuable asset nowadays, because their is a lot of competition for the top positions in Google.
Every web store needs software. There are many packages to choose from and they can be divided into 2 main groups:
In case of SaaS, the cost of hosting is included in the subscription fee, but if you use an opensource package, the server (or hosting account) will be rented or leased. Companies that exist for many years, often have many websites, landing pages and domain names, all mixed to 1 server or 1 account. If you sell your entire company, make sure you can transfer the whole server (check them and delete your private holiday pictures, ZIPs, etc.). Will you keep your company and only sell part of its business? Then create a completely separate hosting account and start transferring the to be sold web store to this account as soon as possible.
Keep in mind that besides the domain name, the e-mail (history) belongs to the sold business. Make sure personal mails are not in the history. Don't delete any conversations with customers or suppliers, whether they are negative or contain compliments.
An online business is more than the store itself. Linked Facebook, Twitter and Instagram accounts add value. These are therefore usually be part of the sale.
Adwords - Google Adwords. Make sure the account is transferred and the bank account is updated afterwards.
Analytics - This is transferable to another Google Account. Preferably, create an account on your business email account and not a private Gmail account.