Custom trial period for plan not working when creating subscription through API

Custom trial period for plan not working when creating subscription through API

I'm trying to set a custom trial period when creating subscription using API (POST /subscriptions)
This is my payload:
  1.             'customer_id' => 'xxxxxxx',
                'plan' => [
                    'plan_code' => 'xxxxx',
                    'setup_fee' => 120,
                    'trial_days' => 15
                ],
                'auto_collect' => false,
Subscription is created, but last billing date is set to today, instead of today+15 days:

  1.   "created_at" => "2021-03-14"
      "activated_at" => "2021-03-14"
      "current_term_starts_at" => "2021-03-14"
      "current_term_ends_at" => "2021-04-14"
      "last_billing_at" => "2021-03-14"
      "next_billing_at" => "2021-04-14"
Also invoice is created and includes both setup fee and full price of the plan.

Expected behavior would be:
- subscription is created
- invoice for setup fee only should be generated
- after trial period expires (2021-03-14 + 15 days), invoice is generated for full plan price
- next billing periods will be counted from the end of trial period (e.g. 2021-03-29, 2021-04-29, etc.)
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