Post apiv1campaigns

Where the ad sends the reader. May carry placeholders that are substituted per placement, so the advertiser's own analytics can tell campaigns and channels apart under the parameter names his reporting already reads: {campaign} becomes the campaign's uuid, {channel} the handle of the channel that published the post (no @, lower case), {platform} the platform in lower case. They may sit anywhere in the URL, query string or path alike, including a bot deeplink payload — https://t.me/mybot?start={campaign}-{channel}. Names are case-insensitive and are stored lowercased, so the value returned by the API may differ from the one sent in exactly that way. Any OTHER {name} is rejected with a 400: an unknown placeholder cannot be filled in and would reach the published post as literal text. Deliberately NOT validated as a URI — a URL carrying a placeholder is not a well-formed one. Example: https://mysite.com/landing?utm_campaign={campaign}&utm_source={channel}

The ad text as markup, written exactly as ValidateAdCopyRequest.text describes it. Create applies the very same rules POST /api/v1/campaigns/ad-copy/validate applies, so a text that validates is a text that creates and there is no second verdict to discover here. Two of those rules decide most refusals: the text must carry at least one {these words are the link}, and it must contain no web address at all beyond one on the advertiser's own domain — the destination is attached to the {...} per placement and never written into the text. A refusal is a 400 whose message lists every problem with the span of the markup it occupies. The cap here is a bound on request size, an order of magnitude above any text that could pass the 700-character visible limit.

Whether a channel manager may propose his own wording of the ad text (a human then approves or rejects it). Absent defaults to true, so deals are not lost over trivial edits.

As stored, which is as it was sent except that the names of any known placeholders (see CreateCampaignRequest.destinationUrl) have been lowercased. Placeholders are never substituted here: what each one becomes depends on the placement, and this is the campaign.