Watson Campaign Automation OAuth tokens have a lifetime of 4 hours, but tokens can be refreshed after 3 hours. If you request before the start of the fourth hour, you receive the same access token that you obtained earlier. If you request after the start of the third hour, a new access token is granted. The user account is going to have two access tokens available to them to use (the first token expires in 1 hour and the second token expires in 4 hours. Request a new token after 3 hours to avoid the unexpected expiration of a single access token.

Examples of code to create an OAuth access token by using PHP.

Example Code

	$host = 'http://engage.com/oauth/token';
	$secret = 'PRODUCTION_USE';
	$refreshToken = 'ac1bfab0-f310-4161-9f6b-53cabac451a8';
	$fields = array(
	'client_id' => $key,
	'client_secret' => $secret,
	'refresh_token' => $refreshToken,
	'grant_type' => 'refresh_token'
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $host);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_POST, count($fields));
	curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($fields));
	$json_result = curl_exec($ch);
	$result = json_decode($json_result);


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