The API support team got me sorted on this. Thanks! in case anyone else is experiencing this problem, here's what was going on. I was using the WordPress wp_http class to create my API call. Here's a copy 'n paste of the relevant information from the email I got: In this case it ended up being the HTTP request function in WordPress following a location header that is returned in order to provide the URI for a campaign when it is created. In order to fix this, a parameter simply needs to be added to the request for 'redirection' => 0. Here’s the difference in the code: Before: $result = $request->request( $url, array( 'method' => 'POST', 'headers' => $headers, 'body' => $body) ); After $result = $request->request( $url, array( 'method' => 'POST', 'headers' => $headers, 'body' => $body, 'redirection' => 0) );
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