etting a user ID ensures subsequent Merchant activity (such as installs or purchases) is attributed to a user.
This can either be your user ID, email or a stable hash of one. You can use this later to look up orders, activity and identify the user in Webhooks.
String with a maximum length of 255.</p>

<p>@note: You should set the user ID in your login handler.</p>
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			<div class="method-subsection declared-in-section">
				<h4 class="method-subtitle">Declared In</h4>
				<p><code