ZAP Credits are applied to your account as a result of Data Cleansing. Data Cleansing is the process of validating the mailing address and that a named individual still resides at the address, and is not deceased.
Credit Refunds
ZAP~POST members with a monthly or annual plan are issued with Zap credits after each submission of recipient data has been completed. PAYG users do not qualify for Zap Credits. Credits are given if a ZAP is not sent following the Data Cleansing process.
The credit system is a simple ratio, based on the count of records that are rejected, per the table below.
There is more information on this topic in the ZAP~POST Academy.
ZAP credits are associated with your account rather than your plan. They will also only roll over to the next billing period - after that, they are lost.