If you include a screenshot of a same-day donation to Wikipedia of 10.42 GBP / 15.42 USD and "d48b8eb9a99bc6MUSTREPLY" in the subject line I will reply to your email.
Notably Jakob does not promise a specific a time frame for reply. It might be long? Hard to collect data on this, but I followed these instructions and have been waiting 5 days. I suspect he is very busy.