<b>SOP: Design a subID schema you can actually read</b>

<b>SOP: Design a subID schema you can actually read</b>
Unstructured subIDs make optimization impossible. Standardize the slots before launch.

— Step 1: Reserve fixed positions: {source}_{campaign}_{creative}_{geo}_{device}_{clickhash}.
— Step 2: Use short codes, not full names — 'fb' not 'facebook', 'us' not 'United States'.
— Step 3: Keep total length under the advertiser's subID character limit (often 50–255; check first).
— Step 4: Pass the same clickhash to every tier in the fallback chain so you can trace which offer served.
— Step 5: Confirm the full string survives every redirect hop unencoded.

If a hop URL-encodes your underscores, switch the delimiter to a pipe or dash that the advertiser preserves.

Lock the schema once set — changing slot order mid-campaign breaks all historical reports.

Audit subID integrity weekly via the advertiser's raw click export.