% eigene Variablen definieren und belegen
\newkomavar[stadt]{fromtown}
\newkomavar[adresse]{fromstreet}
\newkomavar[amtsgericht]{fromcourt}
\newkomavar[ustid]{fromustid}
\newkomavar[iban1]{fromiban1}
\newkomavar[iban2]{fromiban2}
\setkomavar{fromtown}{01234 Musterstadt}
\setkomavar{fromstreet}{Musterstr.\,1}
\setkomavar{fromcourt}{Amtsgericht Musterstadt}
\setkomavar{fromustid}{DE123456789}
\setkomavar{fromiban1}{DE01 2345 6789}
\setkomavar{fromiban2}{2345 6789 01}

\setkomavar{fromname}{Musterfirma GmbH}
\setkomavar{fromaddress}{Musterstr.\,1\\01234 Musterstadt}
\setkomavar{frommobilephone}[\faMobilePhone~]{01\,23 / 456 78 90}
\setkomavar{fromurl}{https://musterfirma.com/}
\setkomavar{fromemail}[\faEnvelopeO~]{rechnung@musterfirma.com}
\setkomavar{place}{Musterstadt}
\setkomavar{placeseparator}{, }
\setkomavar{signature}{Max Mustermann}
\setkomavar{frombank}{Musterbank AG Musterstadt}