The WhatsApp Business API comes with a wall of jargon that can make getting started feel harder than it is. This plain-English glossary explains the key terms you will actually encounter, so you can read any guide or provider page with confidence.
The core players
- WhatsApp Business API: Meta's messaging infrastructure for medium and large businesses - not an app, but a platform you access through a provider. See our overview.
- BSP (Business Solution Provider): the company that connects you to the API and gives you the software you use. Choosing one is covered in our BSP guide.
- WABA (WhatsApp Business Account): your business's account on WhatsApp that holds your numbers and templates.
Messaging terms
- Template message: a pre-approved message format for business-initiated messages - see the approval guide.
- Session message: a free-form reply allowed within the 24-hour customer service window.
- 24-hour window: the period after a customer messages you during which you can reply freely.
- Template categories: Marketing, Utility and Authentication, which affect approval and pricing.
Billing terms
- Conversation: a 24-hour messaging thread that is the unit of billing - see the pricing guide.
- Conversation category: the type of conversation (marketing, utility, authentication, service) that sets the price.
- Markup vs pass-through: whether your provider adds margin on Meta's charges or passes them at cost.
Quality and scaling terms
- Quality rating: a measure of how recipients react to your messages; low ratings risk restrictions.
- Messaging tier: the daily limit of business-initiated conversations, which grows with quality and volume - see messaging tiers.
- Green tick / OBA: the Official Business Account badge granted by Meta based on notability.
- Display name: the business name shown to customers, subject to WhatsApp's naming rules.
Putting it together
With this vocabulary, the pieces connect: you use a BSP to access the API on your WABA, send template or session messages that form billable conversations, and grow your messaging tier by keeping a healthy quality rating. Ready to go deeper? Start with our provider guide.
Frequently asked questions
What is the difference between a BSP and a WABA?
A BSP (Business Solution Provider) is the company that connects you to the WhatsApp API and provides the software you use. A WABA (WhatsApp Business Account) is your business's account on WhatsApp that holds your phone numbers and message templates.
What is a conversation in WhatsApp API billing?
A conversation is a 24-hour messaging thread between your business and a customer, and it is the unit Meta bills on. Its category - marketing, utility, authentication or service - determines the price.
What is the 24-hour window?
When a customer messages you, a 24-hour window opens during which you can reply with free-form session messages. After it closes, you need a pre-approved template message to start the conversation again.
What is a quality rating?
It is a measure of how recipients react to your messages, based on blocks and reports. A low quality rating can restrict your sending, so keeping messages relevant and opted-in protects your reach.
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