Best API to automate LEI validation and issuance for B2B onboarding?

Hey guys, building a cross-border fintech platform and need to integrate LEI (Legal Entity Identifier) checks into our onboarding pipeline to meet MiFID II requirements. I want a fully digital flow, users shouldn't have to leave our app to manually register a code and wait days for a manual review. We need a clean REST API that handles instant lookup, automated corporate registry validation, and bulk issuance in the background. What dev-friendly providers are you guys using that don't require weeks of enterprise sales calls? Update: Found a platform called LEI admin which claims to have a fully automated setup and a dedicated API layer for client workflows. It looks like exactly what our stack needs, but I want real engineering feedback first. Anyone here integrated their API? How is their uptime and sandbox testing environment?