I need to create a custom system workflow message for
Contributions - Receipt (on-line)
that will be used instead of the default template when a particular contribution page is used.
I already know about the
Receipt tab of the contribution page wizard. There I can prepend text to the receipt that is unique to that contribution page.
But I need to fuss with the template itself. I know about the System Workflow Messages at:
civicrm/admin/messageTemplates. The problem there is that the change applies to all contribution receipts. I'm looking to change the template only for a particular contribution page.
I'm using CiviCRM 4.5.8 on Drupal 7.36.