Assuming that Tech Solutions ' INC ( an IT Consulting company ) is CEO hires you as the Project Manager responsible for the implementation of a QMS aimed towards obtaining the ISO 27000 certification . During the implementation process , you notice that you are falling behind schedule and the risk of failing to meet the deadline is beginning to weigh heavily on you . The root cause for the delays is due to the stalling that's coming out of the company's Accounts Payable department whom constantly challenge you on the costs associated to your project . How do you proceed in order to resolve this issue while aiming to deliver the project on time ? write in max 1500 words