Function getCustomers

Returns Promise<
    {
        birthday?: string;
        city?: string;
        company?: string;
        country?: string;
        email?: string;
        firstName?: string;
        houseNumber?: string;
        id: number;
        lastName?: string;
        notes?: string[];
        phone?: string;
        postCode?: string;
        salutation?: string;
        street?: string;
        timestamp?: string;
        uid_number?: string;
    }[],
>