p>Use the Invitations API to invite or add users to a group or project, and to list pending
invitations.</p>
<h2>Valid access levels</h2>
<p>To send an invitation, you must have access to the project or group you are sending email for. Valid access
levels are defined in the <code>Gitlab::Access</code> module. Currently, these levels are valid:</p>
<ul>
<li>No access (<code>0</code>)</li>
<li>Minimal access (<code>5</code>)</li>
<li>Guest (<code>10</code>)</li>
<li>Reporter (<code>20</code>)</li>
<li>Develop