I think here should be $interval instead of $this->interval .

[guoxiangke]

laravel-subscriptions/src/Services/Period.php

Line 63 in 23697d0

$method = 'add'.ucfirst($this->interval).'s';

[guoxiangke]

$user->newSubscription('main', $plan);
TypeError: ucfirst() expects parameter 1 to be string, null given

[tutations]

Same problem

[Karan1458]

I think maintainer is not active. Otherwise someone has already reported this issue in past months.

Pull Request

[Omranic]

Fixed in #27

[ProjectInfinity]

Why was this not merged into master and released with 1.0.1? This is still unusable because $this->interval is null.

[Omranic]

@ProjectInfinity Done https://github.com/rinvex/laravel-subscriptions/releases/tag/v1.0.2