Production SM-DP+ endpoints may use the GSMA RSP2 Root CI1, which is not present in the Alpine system CA bundle. Add the verified root to the ES9+ client's trust pool while preserving the existing public-destination and TLS validation rules.\n\nConstraint: ES9+ TLS must trust the GSMA RSP2 Root CI1 used by production SM-DP+ services.\nRejected: Disable certificate verification or trust the leaf certificate | both weaken server authentication and break rotation.\nConfidence: high\nScope-risk: narrow\nReversibility: clean\nDirective: Keep the additional root scoped to ES9+; update it only from a verified GSMA certificate source.\nTested: go test ./...\nNot-tested: Clean-container live download against every SM-DP+ provider.
Co-authored-by: Meng Meng <[email protected]>
