. "The contractor" will send the bill for the security services of "hired" by the 30th of the month and "employer" must pay a fee for completion no later than the 10th day of the following month.
"Contractor" will send you a bill from the security services "who employed" within 30 days of the month and the "employment" will have to pay a fee to complete no more than 10 days of the next month.
. "employee" will send the Billing service from the "Security contractor" within 30 days of the month and the "employer" will be required to pay a day to finish up the next 10 months.