Short answer
List the customer’s subscriptions and look at how they were created. Also check whether code is creating a new subscription where it should update the existing one. Review which ones are unwanted before cancelling, since cancelling affects billing. Stripe’s error text says to contact Stripe if you receive this error.
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Why the customer has so many subscriptions, and the fix
01
The customer is at the limit
“Each customer can have up to 500 active or scheduled subscriptions.” Stripe, Create a subscription
Count the customer’s active and scheduled subscriptions. If the count is near 500, find out which code created them before cancelling anything.
02
Plan changes create new subscriptions
“When a customer changes their subscription, you must change the subscription item to reflect the new selection.” Stripe, Change the price of existing subscriptions
Also check: an upgrade or downgrade should change the price on the existing subscription item, not add another subscription.
03
Retries or tests pile up subscriptions
Also check: a sign-up or checkout handler that creates a subscription on every attempt, or a test script that reuses one customer. Look for an existing subscription before creating one.
04
The limit is real for your use case
“The maximum number of subscriptions for a customer has been reached.” Stripe, Error codes (customer_max_subscriptions)
If one customer genuinely needs more subscriptions, contact Stripe as the error text says.
Checked against the vendor’s docs on : Stripe docs: Error codes; Stripe API: Create a subscription; Stripe docs: Change the price of existing subscriptions.
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Related: Stripe customer max payment methods · Stripe subscription incomplete · Stripe customer portal not working · Stripe invoice_no_customer_line_items