A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. Contractor and Subcontractors must pay all salaries and wages due all employees performing.An MSA, or Master Service Agreement, is a contract between a company and a vendor that outlines the terms and conditions for services the vendor will provide. Master Participation Agreement within ten (10) business days of closing. 9. In the event that a Monthly Retainer is not timely paid, Consultant may suspend performance for all. Services until payment has been made in full. Monthly payments begin at the turn-up (go live) date. (b) Adjustments to Estimated Base Purchase Price between Closing Date and TRS Payment Commencement Date. (ii) unless otherwise agreed, Buyer shall pay all expenses incurred in opening an escrow account for the Earnest Money. 31. 7. Mortgage Contingency.