While there are no formal education requirements to work as a courtesy clerk, there are some personal requirements that an individual needs to meet. (coverlettersandresume.com)
An offer letter is a formal document which is provided by a company to a candidate that they have already interviewed. (template.net)
A business letter is a formal document often sent from one company to another or from a company to its clients, employees, and stakeholders, for example. (thebalance.com)