QuickBooks/QBXML/Object/Invoice.php
public function setPaymentMethodApplicationID($value)
	{
		return $this->set('PaymentMethodRef ' . QUICKBOOKS_API_APPLICATIONID, $this->encodeApplicationID(QUICKBOOKS_OBJECT_PAYMENTMETHOD, QUICKBOOKS_LISTID, $value));
	}
public function setPaymentMethodApplicationID($value)
	{
		return $this->set('PaymentMethodRef ' . QUICKBOOKS_API_APPLICATIONID, $this->encodeApplicationID(QUICKBOOKS_OBJECT_PAYMENTMETHOD, QUICKBOOKS_LISTID, $value));
	}
Set the application ID for the payment method

@param mixed $value		The payment method primary key from your application
@return 					boolean