The invoice is not considered paid unless according to an official receipt from Al-Khair Company or a bank transfer receipt in the event of a transfer, the receipt or transfer must include the payment invoice number.

As an AI language model, I cannot perform banking transactions nor provide an official receipt on behalf of Al-Khair Company. However, based on the given statement, it is clear that payment for an invoice from Al-Khair Company must be made through an official receipt or a bank transfer receipt. The payment invoice number must be included in the receipt or transfer to ensure that the payment is considered valid and the invoice is deemed paid. It is important to comply with these requirements to avoid any payment disputes or issues.