We are switching to Authorize.net as payment processor. The Invoice ID in CiviCRM is 32 characters. However, Authorize.net's Invoice Number field is only 20 characters. The Invoice ID when passed to Authorize.net is getting truncated. Can the Invoice ID in Civi be shortened? to 20 characters? If so, what is the impact on existing transactions?
We are currently on Civi 4.6 but will be upgrading to 4.7 within the next 2 months. On Drupal 7.