Cannot activate a manually-collected subscription

{
  "error": {
    "type": "request_error",
    "code": "subscription_manual_collection_mode_activation_not_allowed",
    "detail": "Unable to activate subscription where collection_mode is manual",
    "documentation_url": "https://developer.paddle.com/errors/subscriptions/subscription_manual_collection_mode_activation_not_allowed"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}

Details

Status code

400

Error code

subscription_manual_collection_mode_activation_not_allowed

Error message

Unable to activate subscription where collection_mode is manual

Common causes

• You're trying to activate a manually-collected subscription, which is not possible.

Troubleshooting

• Change the billing date of the subscription instead. Set the next_billed_at to 30 minutes after the time of your request, then wait 30 minutes for the subscription to become active.
• Wait for the subscription to become active at the end of the trial period.