post https://a.klaviyo.com/api/profile-subscription-bulk-create-jobs/
Subscribe one or more profiles to email marketing, SMS marketing, or both. If the list has double opt-in enabled, profiles will receive a message requiring their confirmation before subscribing. Otherwise, profiles will be immediately subscribed without receiving a confirmation message.
To add someone to a list without changing their subscription status, use Add Profile to List.
Maximum number of profile can be submitted for subscription: 100
Rate limits:
Burst: 75/s
Steady: 700/m
Scopes:
List Write
Profiles Write
Subscriptions Write