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One of the options for getting a list of email campaigns is below. Can you give more explanation of this 'modified_since'? Does it mean that a campaign can be changed and then resent? Thanks (also, how to you mark a post 'answered' on this forum?
Retrieve only contacts modified since the time specified (in ISO-8601 format)
The modified_since parameter for campaigns refers to the most recent change(such as a change in their status or contents). After a campaign has been sent, the only reason this could change is if you were to trigger a re-send of the campaign. Additionally, it is not possible to edit the contents of a campaign once it has been sent.