Just curious: why are unicode values not being cleansed/translated before the information gets sent to Stripe? As far as I know, data like this very rarely makes its way into Splunk, and much of what passes as weird UTF-8 codes do not make it into Splunk at all.
Ian Quick shared this example code with us that shows how to test for uTF-8 characters and strip them out: https://github.com/Shopify/shopify-tracing/commit/816ba2aef3c6ee8a232766028181b7b1ca03a2b1
I'd highly recommend cleansing your data before emitting to Stripe. Once the data is in Splunk, 99.9% of the UTF code will be lost and Splunk will not help you debug that issue. Cleansing your output before it hits Stripe is probably the best course of action.
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