In WHMCS, by default the ‘Automatic Credit Use’ option on new invoices can only be disabled or enabled system-wide for all clients universally, and cannot be enabled/disabled on a per-client basis. In addition to that, only admins can disable or enable this option.
However, in certain scenarios, some clients have more than one active service on their accounts (such as freelancers and agencies who handle billing on their customers’ behalf), so they don’t want all of the services to renew automatically as a result of ‘Automatic Credit Use’ before first getting payments from their end-customers. On the other hand, some clients may want to have Automatic Credit Use for their renewal invoices by default.
