You will need the following for Cloud API setup.
When your Facebook Business is not verified, you’re subject to a few limitations –
If the conversation is initiated by the user, you can send unlimited replies to those conversations without any limitations.
Every new Verified WhatsApp-enabled Sender is initialized as being allowed 1000 business-initiated conversations with unique customers in a rolling 24-hour period. If the Sender reaches the messaging limit, more conversations can be started as soon as one or more active conversation ends.
WhatsApp monitors message volume as well as quality, and will automatically move customers between tiers based on the total number of unique business conversations across the past 7 days.
In order to maintain high quality, WhatsApp recommends the following:
Businesses using the WhatsApp Business Platform are charged per conversation, which includes all messages delivered in a 24 hour session. Check each country-wise charges.