[gtramont]

This doesn't really matter. What you'll end up exposing via your API is your use case! Does your system allow for an account to be closed? Awesome! So let the client know how to do it.

If you're speaking HTML it can be as simple as:

  <form action="/close-account?acc_number=12345" method="POST">
    <button>Close Account</button>
  </form>

Or even:

  <form action="/close-account" method="POST">
    <input type="hidden" name="acc_number" value="12345">
    <button>Close Account</button>
  </form>

If you're speaking Siren (https://github.com/kevinswiber/siren):

  {
    "actions": [
      {
        "title": "Close Account",
        "method": "POST",
        "href": "/close-account",
        "type": "application/x-www-form-urlencoded",
        "fields": [
          { "name": "acc_number", "type": "hidden", "value": "12345" }
        ]
      }
    ]
  }