GET /customers/{id}/kyc_link

Hosted KYC flow for an existing customer. Distinct from POST /kyc_links, which creates a fresh link + stub customer in one call. Use this when the customer already exists and just needs to complete KYC.

Response shape matches GET /kyc_links/{id}.

curl "$BASE_URL/customers/cust_01HZ…/kyc_link" \
  -H "Api-Key: $SEISMIC_ORCHESTRATION_API_KEY"