Dear Felix
We have just received your payment for [PRODUCT (S)/SERVICE (S), your order of five Magna flux compressors]. Thank you for your business!
I’m certain you would be interested in a discount. If payment for your orders are received within [X] days of the invoice date, you are entitled to a [Y]% discount.
Please call me at XXX-XX-XX if there is anything I can do for you.
Regards
Lydia