German phrase
Bitte melden Sie sich, wenn ~ erledigt ist.
Meaning
Please get in touch when ___ is taken care of
When to use it
Contact me after it's done. This polite wording is useful in business.
Example dialogue
Bitte melden Sie sich, wenn die Rechnung erledigt ist.
Please get in touch when the invoice is taken care of.
Alles klar, ich melde mich, sobald die Zahlung erfolgt ist.
All right, I will get in touch as soon as the payment has gone through.