No warrant for the payment of any claim shall be issued by the finance director until such claim shall have been approved by the finance director, the head of the department for which the indebtedness was incurred, the purchasing officer and the city manager, and such officers and their sureties shall be liable to the municipality for all loss or damage sustained by the municipality by reason of the unlawful approval of any such claim. Whenever any claim shall be presented to the finance director, he shall have power to require evidence that the amount claimed is justly due and is in conformity to law and ordinance, and for that purpose he may summon before him any officer, agent or employee, or any department of the municipality, or any other person, and examine him upon oath or affirmation relative thereto. The chief executive officer, whatever his title, and the purchasing agent, if any, for any administrative board or commission shall comply with this section.