To use the Cloud API, BSPs need to have the following assets:

Asset	Specific Instructions
Business Manager	You can use an existing, or set up a new one. Save the Business Manager ID.
WhatsApp Business Account (WABA)	See Create a WhatsApp Business Account for the WhatsApp Business API for help.
Meta App	If you don’t have an app, you need to create one with the “Business” type. Remember to add a display name and a contact email to your app. As a BSP (Business Solution Provider), your app must go through App Review and request Advanced Access to the following permissions: * whatsapp_business_management — Used to manage phone numbers, message templates, registration, business profile under a WhatsApp Business Account. To get this permission, your app must go through App Review. * whatsapp_business_messaging — Used to send/receive messages from WhatsApp users, upload/download media under a WhatsApp Business Account. To get this permission, your app must go through App Review. * business_management See a sample App Review submission here. As a BSP, you can also feel free to use the same Meta app across different clients and WABAs. But be aware that each app can only have one webhook endpoint and each app needs to go through App Review.
System User	See Add System Users to Your Business Manager for help. Currently, a Meta App with whatsapp_business_messaging, whatsapp_business_management, and business_messaging permissions has access to up to: * 1 admin system user, and * 1 employee system user We recommend using the admin system user for your production deployment. See About Business Manager Roles and Permissions for more information.
Business Phone Number	This is the phone number the business will use to send messages. Phone numbers need to be verified through SMS/voice call. For BSPs and Direct Businesses: If you wish to use your own number, then you should add a phone number in WhatsApp Manager and verify it with the verify endpoint via Graph API. For Businesses using BSPs: If you wish to use your own number, then you should add and verify their numbers using the BSP’s Embedded Signup flow. The verification status of a phone number doesn't impact the migration between On-Premises and Cloud API. If you don't have access to Embedded Signup to verify phone numbers, we recommend verifying the phone numbers using the On-Premises solution, and then migrating those numbers to the Cloud API. There is no limit to the amount of business phone numbers that can be onboarded to the Cloud API. Only one phone number can be used on a platform at a time: One for Cloud API and another for On-Premises. This means that you cannot use a production phone number with both the On-Premises and Cloud APIs. We recommend doing any testing with a test number (either an existing test number or a new one) and then moving your own phone number to the Cloud API when you’re confident you’re ready for production use.
Consumer Phone Number	This is a phone number that is currently using the consumer WhatsApp app. This number will be receiving the messages sent by your business phone number.