In rare cases, some churches' banks will have a security prevention which stops Tithe.ly from debiting your account. This will cause problems in the case of refunded or reversed donations, so to get around this, the church administrator will need to provide their bank with Tithe.ly's "allowable ACH codes". If you don't know what these are, then this probably doesn't apply to your church!
Below you'll find Tithe.ly's ACH company IDs to whitelist for account debits. Here they are:
WFMSTRIPE1, 3270465600, 1800948598, 2270465600.