This e-book provides templates for 21 most effective credit and collection letters that will help you communicate better with your customer. Learn how to craft an effective line cook cover letter that highlights your skills, experiences, and passion for the industry.Before we begin our sample messages, watch this video to learn about the proper format for an employee appreciation letter. Fill in the To field and the Subject. In the Body explain what you want and for what plus how it benefits the company then sign and send it. Work certificate contains information about your employment experiences in the company. Download out free certificates of employment templates! Get your free copy here! A proof of income letter should clearly state one's basic income information, including workweek hours, annual income or wage per hour. The FLSA permits an employer to take a tip credit toward its minimum wage and overtime obligation(s) for tipped employees per Section 3(m)(2)(A).