Outposts once deployed come with an initial 4 Store contract slots. All Outposts come with a General Store and Commercial Storage by default, and these two stores do not time out.
This will display a list of the stores currently open to Outposts. You will note that they are not all available, and the list will show the level of required by your Outpost to be able to open a contract with the company in question.
You will also see a Credit value and the number of days the contract will be open. Furthermore, you can cancel a contract, but the vendor is under no obligation to refund you, as they will have an outlay to set up and open a store for you.
You will see a list of any contracts that you have open, and if the vendor is a Taxable income stream, you can see how much tax they have generated for you.
You can close a contract at any time, but you will not receive a refund!
Note: Not all contracts will generate funding.