track affiliate links and leads

when someone clicks an ad from Instagram, Facebook, Google, TikTok, etc., the landing URL often includes tracking query parameters. Some are standardized, some are platform-specific.

The most common “standard” is UTM parameters, originally popularized by Google Analytics:

```
?utm_source=instagram

&utm_medium=cpc

&utm_campaign=summer_sale

&utm_content=video1

&utm_term=travel_deals
```

These are widely used across almost every ad platform and analytics tool.

Typical meanings:

* utm_source → where traffic came from (facebook, instagram, google)
* utm_medium → traffic type (cpc, paid_social, email)
* utm_campaign → campaign name
* utm_content → creative/ad variation
* utm_term → keyword or audience

## All Affiliate link brands:

* Instagram / Facebook → fbclid
* Google Ads → gclid
* Microsoft Ads / Bing → msclkid
* TikTok → ttclid
* LinkedIn → li_fat_id
* Twitter / X → twclid
* Snapchat → ScCid
* Pinterest → epik
* Reddit Ads → rdt_cid
* YouTube Ads → usually gclid (Google ecosystem)

Common cross-platform tracking params:

* utm_source
* utm_medium
* utm_campaign
* utm_content
* utm_term

Holiday / affiliate / travel industry params:

* affid
* aid
* partner_id
* partner
* subid
* sub_id
* clickid
* click_ref
* campaign_id
* ref
* source
* cid
* hotel_id
* offer_id
* locale
* market
* currency
* destination
* checkin
* checkout
* adults
* children

Common travel affiliate platforms:

* Booking.com → aid
* Expedia → affcid
* Agoda → cid
* Travelpayouts → marker
* CJ Affiliate → sid
* Awin → clickref
* Impact → subId1
* Rakuten Advertising → u1