You can use "Manual" type payment for this purpose. This payment type can be used for any payment that requires an action that cannot be done directly from the site, for example sending a physical check to an address, wiring the money to a bank account and so on.
This payment type is advised to be set as pending, so the actions that are paid with this type of payment will remain pending until you are able to check that the payment is done.
To setup this type of payment all you need to do is edit the emails and info messages that are sent to the user after choosing this payment.

You will need to do this from the sections Templates / Mail Templates and Templates / Info Templates.

In Templates / Mail Templates section you will need to edit the emails that require payments and replace the part that is marked by the following comment : 

{* ------------ PLACE HERE THE BANK ACCOUNT, CHECK ADDRESS OR ANY OTHER METHOD TO PAY MANUALLY ---------------- *}

 with your payment information.

The email templates that need to be edited are: "ad_publish_status", "buy_store_status", "subscription_status", "ad_options_upgrade_status".

In Templates / Info Templates you will need to edit the information shown to the user when a payment is done. You will also need to replace the part marked with the upper comment with your payment data. 

The info templates that need to be edited are: "ad_publish_status", "buy_store_status", "subscription_status", "ad_options_upgrade_status".