Who should be the store manager, representative?

In the case of a general partnership (kkt.) and a limited partnership (bt.):

The managing director may only be a natural person who may be elected by the company's general meeting for a fixed term of up to five years, but the articles of association may provide otherwise, meaning that the managing director may also be elected for an indefinite term if the articles of association so permit. More than one managing director may be elected, but it must be specified whether the company is represented independently (i.e. by each managing director separately) or jointly (i.e. by two or more managing directors together).