def ecommerce_coupon_url(self, instance):
if not instance.entitlement_id:<EOL><INDENT>return "<STR_LIT>"<EOL><DEDENT>return format_html(<EOL>'<STR_LIT>',<EOL>base_url=settings.ECOMMERCE_PUBLIC_URL_ROOT, id=instance.entitlement_id<EOL>)<EOL>
Instance is EnterpriseCustomer. Return e-commerce coupon urls.