One API for LinkedIn, WhatsApp and Email outreach

Building an AI sales agent on the side. The LLM part is the easy 20%. The hard 80% is the outreach plumbing - LinkedIn, WhatsApp, and Email each come with their own auth model, their own rate limits, their own webhook flavor, and their own way of breaking on a Tuesday afternoon. Three integrations, three sets of edge cases. Before my agent could send a single message, I'd spent a full week on glue code and zero time on the agent itself. So I stopped maintaining the plumbing and pushed it to Linkup.