Create newsletter list subscription OAuth Scope: newsletter_lists:write
Create newsletter list subscription OAuth Scope: newsletter_lists:write
Subscribe a subscription to a newsletter list. Accepts either a subscription_id or email to identify the subscription.
<Info> This endpoint only enrolls **existing** subscriptions. To create a new subscription **and** enroll it in one or more newsletter lists in a single call, use the [Create subscription](/api-reference/subscriptions/create) endpoint and pass the `newsletter_list_ids` parameter. </Info>