tiveName";"letterId";"link"
"123";"Name";"11059";"Creative_1";"12345";"1"
"123";"Name";"11059";"Creative_1";"12345";"2"
"123";"Name";"11059";"Creative_1";"12346";"1"
</code>
* adCampaignID [int]: ID of ad-campa... of ad-campaign
* adCreativeID [int]: ID of ad-creative (promio internal)
* adCreativeName [string]: na
io.net newsletter",
"locale": "de_DE",
"creative": {
"content": "<html>\n <head>\n <title... createMessage|REST API - create message]]
* //creative//:
* required for messages that are not cre... st mail]]
**Important:** \\
The source code in //creative// and //text// must be "prepared" for json.
The ... "sendFromName": "promio.net newsletter",
"creative": {
"content": "<html>\n <head>\n <titl
