Get WhatsApp signup config
Returns what the browser needs to open Meta’s Embedded Signup popup: the Facebook Login for Business configuration id, the Graph version to run against, and the scopes it will request. Answered in-process rather than forwarded, so the first step of onboarding survives an outage of the private service. Pass configId to FB.login as config_id with response_type: 'code' and override_default_response_type: true. Do NOT add a featureType — omitting it is what keeps the phone-number screen in the flow, and only_waba_sharing produces an account with no number that cannot be provisioned. Requires the platforms:read permission bound to the project resource in the path.
Authorizations
Account Service Key, prefixed with pho_ask_, sent as Authorization: Bearer <key>. Acts on behalf of its owning account, subject to the permissions and credential restrictions of each operation. Account access tokens and OAuth grants also use the Bearer header. In organizations that require SSO, Account Service Keys are not accepted for managing the organization's SSO settings, deleting the organization, or checking whether it can be deleted.