Revenue is income or a credit.
Service Revenue is credit in nature because it is an income.
debit
A credit
[Debit] Revenue receivable [Credit] Accrued revenue
revenue accounts increase by credit
Debit
Revenue is always credit as all revenue accounts has credit balance as normal balance and cash received or accounts receivable is debit against it.
Default balance for revenue is credit balance so to reduce a revenue account it must be something with debit balance so debit is a decrease in revenue.
If revenue (income of money) is a credit, then an expense (outflow of money) is a debit.
Revenues has credit balance as default balance and as services revenue is also a revenue account it means it should have credit balance as well and not a debit balance.
[Debit] Cash xxxx [Credit] revenue xxxx
If revenue (income of money) is a credit, then an expense (outflow of money) is a debit.