BSPs aggregate Meta's WhatsApp API and resell it with a layered platform — usually adding features Meta doesn't have natively (multi-agent inbox, CRM, broadcast tools, template management, automation).
Indian-market BSPs include Wati, Gupshup, Interakt, AiSensy, Gallabox, Whatsoever, Doggu, and many smaller players. Pricing is conversation-based (Meta passes through) plus a platform fee per number.
The alternative is direct Cloud API — connecting straight to Meta without a BSP. Cheaper per message but requires more engineering.