Dynamic tracking parameters

Pinterest supports dynamic tracking parameters, which are placeholder text that start and end in curly brackets and can be added to URLs. These enable advertisers to collect additional information from Pinterest on a click for campaign tracking purposes.

Supported dynamic parameters for all campaigns:

• {campaignid}
• {campaign_name}
• {adgroupid}
• {adgroupname}
• {adid} - the pin promotion id
• {device} - ‘t’, ‘c’, or ‘m’ for tablet, computer or mobile

Example: a landing URL provided by a retailer may look like this:
retailer.com/mens-clothing/?cid={campaignid}
if the Pinterest campaign id is 1234, Pinterest will serve this URL as:  
retailer.com/mens-clothing/?cid=1234

Supported dynamic parameters for Search Campaigns: 

• {keyword} - the percent-encoded keyword string (e.g. running%20shoes) that matched the promoted pin
• {keyword_id} - the keyword ID that matched the promoted pin

Note that dynamic parameters we don’t support will be ignored - for example if the retailer provides this URL: retailer.com/mens-clothing/?cid={CAMPAIGN-ID} we will ignore the tracking parameter and just serve the URL as retailer.com/mens-clothing/?cid={CAMPAIGN-ID}

Source: help.pinterest.com/en/business/article/third-party-and-dynamic-tracking