
kassieren
to collect payment
To receive money for goods sold or a service provided. This is the typical activity at a checkout or cash register.
Der Kellner kommt gleich, um zu kassieren.
The waiter will be right over to collect payment.
to collect / receive
Loading your saved state.

to collect payment
To receive money for goods sold or a service provided. This is the typical activity at a checkout or cash register.
Der Kellner kommt gleich, um zu kassieren.
The waiter will be right over to collect payment.

to concede / get
Colloquially, to receive something negative, such as a defeat, a penalty, criticism, or a goal against you in sports.
Unsere Mannschaft hat kurz vor Schluss noch ein Tor kassiert.
Our team conceded another goal shortly before the end.

to confiscate
Colloquially, to collect or take away an item, often as a punishment or because someone is not authorized to have it.
Die Polizei hat seinen Führerschein kassiert, weil er zu schnell gefahren ist.
The police confiscated his driver's license because he was driving too fast.

to annul
In legal language, to overturn a judgment, law, or decision and declare it invalid.
Das Obergericht hat das Urteil der ersten Instanz kassiert.
The higher court annulled the judgment of the court of first instance.
The verb 'kassieren' derives from the noun 'die Kasse' (cash register/checkout). The basic meaning is therefore the activity performed at a checkout: taking in money.
Bitte gehen Sie zum Bezahlen an die Kasse, dort wird kassiert.
Please go to the checkout to pay; payments are collected there.
In the meaning 'Geld entgegennehmen' (to receive/collect money), 'kassieren' can also stand without an object. It then simply means 'to carry out the payment process'.
Entschuldigung, könnten wir bitte zahlen? Ich würde gerne kassieren.
Excuse me, could we please pay? I'd like to settle the bill.
This meaning is colloquial and is always used with something negative. Typical combinations are 'ein Gegentor kassieren' (to concede a goal), 'eine Niederlage kassieren' (to suffer a defeat), or 'eine Strafe kassieren' (to get a penalty).
Für das falsche Parken hat er einen Strafzettel kassiert.
He got a parking ticket for parking illegally.
This meaning is also colloquial. It describes how a person in authority (e.g., police, teacher) confiscates something as a punishment. Typical objects are 'das Handy' (the mobile phone), 'der Ball' (the ball), or 'der Führerschein' (the driver's license).
Der Lehrer hat mein Handy kassiert, weil ich im Unterricht gespielt habe.
The teacher confiscated my phone because I was playing in class.
In the meaning 'für ungültig erklären' (to declare invalid), 'kassieren' is formal technical language from the field of law and administration. It is used for judgments, laws, or resolutions.
Der Verwaltungsgerichtshof hat die neue Verordnung kassiert.
The Higher Administrative Court annulled the new regulation.
to pick up / keep / cancel
Aufheben and kassieren can both make a decision invalid. Aufheben is the general, formal term for this. Kassieren sounds more colloquial and emphasizes that a reviewing authority has eliminated the decision; in a formal text, aufheben is usually more appropriate.

Das Berufungsgericht kassierte das Urteil der ersten Instanz.
The appellate court threw out the judgment of the court of first instance.
Das Berufungsgericht hob das Urteil der ersten Instanz auf.
The appellate court overturned the judgment of the court of first instance.