German phrase
Bitte senden Sie die Quittung per ~.
Meaning
Please send the receipt by ___
When to use it
A polite request. It specifies how the receipt should be sent.
Example dialogue
Bitte senden Sie die Quittung per Post.
Please send the receipt by post.
Gern, an welche Adresse darf ich sie schicken?
Certainly, to which address may I send it?