The example is mine.

A message to my fitness instructor. (I have some prepaid sessions in my account.)

Hello. I'm afraid I need to skip our appointment due to unforeseen circumstances. I'm aware that since today's session has been canceled on such short notice, it will be charged in the system. See you Monday.

Should I use "it will be charged to my account" or just "it will be charged", or maybe in the active voice "the system will charge it" or "the system will charge it to my account"?

Oxford Dictionary offers these patterns, but I'm not sure I understand number 2:

1. charge something to something They charge the calls to their credit-card account.
2. (North American English) charge something Don't worry. I'll charge it (= pay by credit card).
3. charge something against something Research and development expenditure is charged against profits in the year it is incurred.

The example is mine.

A message to my fitness instructor. (I have some prepaid sessions in my account.)

Hello. I'm afraid I need to skip our appointment due to unforeseen circumstances. I'm aware that since today's session has been canceled on such short notice, it will be charged in the system. See you Monday.

Should I use "it will be charged to my account" or just "it will be charged", or maybe in the active voice "the system will charge it" or "the system will charge it to my account"?

Oxford Dictionary offers these patterns, but I'm not sure I understand number 2:

1. charge something to something They charge the calls to their credit-card account.
2. (North American English) charge something Don't worry. I'll charge it (= pay by credit card).
3. charge something against something Research and development expenditure is charged against profits in the year it is incurred.