According to the changes made by Comodo for DCV validation methods, we have updated returned values for API method retrieveOrderSslCertRequest.
The structure of the parameter additionalData is the following now:
3eeb773a542f247c99348292612eb545 bbf760aa34f34dcaeb01a9bc1c8ee729a2cbd6f1198d16a4d6eb6c2e6ca396c6 bbf760aa34f34dcaeb01a9bc1c8ee729a2cbd6f1198d16a4d6eb6c2e6ca396c6 example.com/.well-known/pki-validation/3EEB773A542F247C99348292612EB545.txt bbf760aa34f34dcaeb01a9bc1c8ee729a2cbd6f1198d16a4d6eb6c2e6ca396c6.comodoca.com _3eeb773a542f247c99348292612eb545.openprovider.com bbf760aa34f34dcaeb01a9bc1c8ee729.a2cbd6f1198d16a4d6eb6c2e6ca396c6.comodoca.com
There are new fields sha256, fileLocation and fileContents for HTTP(s) validation and dnsrecord and dnsValue for DNS type of validation.
For the cases when you use a previously used CSR for a reissue, renewal or new order, Comodo will add a unique value to the file contents or the DNS record to prevent that the old one is re-used without knowing. An example for a DNS record in such a case:
_c7fbc2039e400c8ef74129ec7db1842c.example.com CNAME c9c863405fe7675a3988b97664ea6baf.442019e4e52fa335f406f7c5f26cf14f..comodoca.com
That is why we highly recommend you to use values returned in the new fields fileContents and dnsValue instead of generating values for DCV validation on your side.
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