flexible subscription plan with stripe

Something like this? I know this was possible before. Not sure if they've changed their API.

\Stripe\Charge::create([
    'amount'   => $amount,
    'card'     => $card,
    'currency' => 'usd',
    'customer' => $customer,
    'metadata' => $meta,
]);

that how you make a one-time charge, am talking about using casher normally but instead of using a fixed plans i wanna see if can somehow have fixability with the plan price

Never tried that. Post a solution when you find it :)

You should use metered billing.

There are multiple strategies for this. The simplest solution might be to have a plan that reflects the smaller common divider.

$plan = \Stripe\Plan::create([
    'currency' => 'usd',
    'interval' => 'month',
    'product' => 'prod_CHxGUqw1dyKsDM',
    'nickname' => 'Unit Plan',
    'amount' => 100, // = 
    'usage_type' => 'metered',
]);

Then you record the usages.

// Monthly Plan
\Stripe\SubscriptionItem::createUsageRecord(
  '{{SUBSCRIPTION_ITEM_ID}}',
  [
    'quantity' => 100, // = 100x
    'timestamp' => 1522893428,
    'action' => "increment",
  ]
);
//  Add-on
\Stripe\SubscriptionItem::createUsageRecord(
  '{{SUBSCRIPTION_ITEM_ID}}',
  [
    'quantity' => 25, // = 25
    'timestamp' => 1522893428,
    'action' => "increment",
  ]
);