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The use of alphanumeric sub IDs is highly recommended. Special characters (such as ß, ç or æ) should be submitted URL-encoded. Full stops, commas, quotation marks etc. should be avoided. If you export your sub ID data, particularly with Excel, make sure you use UTF-8 characters instead of ISO-formats.
Also, please note that the value for each smc parameter (sub ID) should not exceed 255 characters. Longer values will be shortened.
reporting and recommendations
For smc1 there is a report showing aggregated numbers under Insights > Reporting > SubIds. It will show clicks and conversions per subId. Please note: In case you use unique values for smc1 such as a clickId, the report will show only conversions (no clicks).
We recommend therefore, to use for unique values (like clickIds) smc2 (or higher, like smc3...)
All six subIds (smc1 - smc6) will be shown as part of attributed conversions under finance > conversions for every conversion in the UI and in the touchpoint export (bottom of the same page).