Update merchant onboarding record with gateway merchant ID

Your boarding webhooks miss processor IDs, leaving onboarding and billing stalled. This writes the gateway merchant ID back to the record so coordinators can complete activation same day.

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Overview

When boarding responses don't write back, account activations and billing setups stall and require manual fixes. This flow captures the gateway reply, extracts the processor ID, and writes it to the merchant record so coordinators can finalize activation same day.