rcp_add_subscription_form

Used to inject content into the "Add New Level" table. This can be used to add a new field to the "Add New Level" form.

For saving the custom value, you'll want to use the rcp_add_subscription action.

Example:

function rcpga_add_groups_checkbox_subscription_form() {
?>
<tr class="form-field">
	<th scope="row" valign="top">
		<label for="rcpga-group-seats-allow"><?php _e( 'Allow Group Account', 'rcp-group-accounts' ); ?></label>
	</th>
	<td>
		<input id="rcpga-group-seats-allow" type="checkbox" name="rcpga-group-seats-allow" />
		<p class="description"><?php _e( 'Check to enable group accounts for this subscription level.', 'rcp-group-accounts' ); ?></p>
	</td>
</tr>
<?php
}
add_action( 'rcp_add_subscription_form', 'rcpga_add_groups_checkbox_subscription_form' );