The short version
A Tech Provider is a company approved by Meta to build software on the WhatsApp Business Platform and to onboard businesses to it. WhatsCommerce is one.
What it means for you
You connect through Meta’s own sign-up, so you never share a password. Your number and your WhatsApp Business Account belong to you, and Meta bills its message charges to your Meta account directly.
What to check in any provider
Ask who owns the number, how message charges are billed, whether there is a markup on Meta’s price, and what happens if you leave.