
einlösen
to redeem
To exchange a voucher, prescription, or check for goods, a service, or money.
Sie können diesen Gutschein in jeder unserer Filialen einlösen.
You can redeem this voucher in any of our branches.
to redeem / fulfill
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to redeem
To exchange a voucher, prescription, or check for goods, a service, or money.
Sie können diesen Gutschein in jeder unserer Filialen einlösen.
You can redeem this voucher in any of our branches.

to fulfill
To put a promise, threat, or expectation into action; to fulfill it.
Endlich hat er sein Versprechen eingelöst und uns zum Essen eingeladen.
He finally fulfilled his promise and invited us out to eat.
'Einlösen' (to redeem / fulfill) is a separable verb. In a main clause, the prefix 'ein-' goes at the end of the sentence. In a subordinate clause or in the infinitive with 'zu', the verb is not separated.
Ich löse meinen Gutschein an der Kasse ein.
I redeem my voucher at the checkout.
The object of the verb reveals the meaning. If it is a concrete means of exchange such as 'Gutschein' (voucher), 'Scheck' (check), or 'Rezept' (prescription), the first meaning is intended. With abstract nouns such as 'Versprechen' (promise), 'Drohung' (threat), or 'Hoffnung' (hope), it is about the second, figurative meaning.
Ich muss noch mein Rezept in der Apotheke einlösen.
I still need to redeem my prescription at the pharmacy.
Common combinations for exchanging something are: 'einen Gutschein einlösen' (to redeem a voucher), 'einen Rabattcode einlösen' (to redeem a discount code), 'Bonuspunkte einlösen' (to redeem bonus points), or 'ein Rezept einlösen' (to redeem a prescription).
Online können Sie den Rabattcode direkt im Warenkorb einlösen.
Online, you can redeem the discount code directly in the shopping cart.
In the figurative meaning, 'einlösen' (to fulfill) is often used with abstract concepts: 'ein Versprechen einlösen' (to fulfill a promise), 'eine Drohung einlösen' (to carry out a threat), or 'Erwartungen einlösen' (to meet expectations).
Die Mannschaft konnte die hohen Erwartungen der Fans nicht einlösen.
The team could not fulfill the fans' high expectations.
to use
Using a voucher generally means using it to pay for a purchase or service. Einlösen more precisely refers to exchanging the voucher for the goods, service, or corresponding amount of money. That is why einlösen is particularly appropriate when presenting it at the checkout.

Ich löse den Gutschein beim Bezahlen der neuen Jacke ein.
I am redeeming the voucher when I pay for the new jacket.
Ich verwende den Gutschein für den Kauf einer neuen Jacke.
I am using the voucher to buy a new jacket.