The contact ID for the client or agency who takes care of billing issues.
Source
<xs:elementminOccurs="0"name="BillingContactID"type="xs:long"xmlns:xs="http://www.w3.org/2001/XMLSchema"><xs:annotation><xs:appinfo/><xs:documentation><summary>The contact ID for the client or agency who takes care of billing issues.</summary></xs:documentation></xs:annotation></xs:element>