Hi! I have the trial period set at a higher amount, since it seems to be the way to charge a set up fee or to make the first month have a different price than the remainder.
Today I cancelled one subscription per user’s request, the IPN was sent to s2Member but it returned [0] => Ignoring this Webhook/IPN. The event does NOT require any action on the part of s2Member. instead of setting the EOT as it should.
Below a copy of the log entry for the event. I wonder if the same issue will happen when a subscription is cancelled after those 30 days for someone else. I’ll keep you all posted as usual 
LOG ENTRY: Wed Nov 25th, 2020 @ precisely 1:24 am UTC
PHP v7.4.10 :: WordPress v5.5.3 :: s2Member v200301 :: s2Member Pro v200301
Memory 5.97 MB :: Real Memory 2.00 MB :: Peak Memory 6.04 MB :: Real Peak Memory 2.00 MB
<<notification url *** redacted ***>>
User-Agent: Stripe/1.0 (+https://stripe.com/docs/webhooks)
Array
(
[event] => Stripe\Event Object
(
[id] => *** redacted ***
[object] => event
[api_version] => 2020-08-27
[created] => 1606267446
[data] => Stripe\StripeObject Object
(
[object] => Stripe\Subscription Object
(
[id] => *** redacted ***
[object] => subscription
[application_fee_percent] =>
[billing_cycle_anchor] => 1608010061
[billing_thresholds] =>
[cancel_at] => 1608010061
[cancel_at_period_end] => 1
[canceled_at] => 1606267446
[collection_method] => charge_automatically
[created] => 1605418061
[current_period_end] => 1608010061
[current_period_start] => 1605418061
[customer] => *** redacted ***
[days_until_due] =>
[default_payment_method] =>
[default_source] =>
[default_tax_rates] => Array
(
)
[discount] =>
[ended_at] =>
[items] => Stripe\Collection Object
(
[object] => list
[data] => Array
(
[0] => Stripe\SubscriptionItem Object
(
[id] => *** redacted ***
[object] => subscription_item
[billing_thresholds] =>
[created] => 1605418062
[metadata] => Stripe\StripeObject Object
(
)
[plan] => Stripe\Plan Object
(
[id] => *** redacted ***
[object] => plan
[active] => 1
[aggregate_usage] =>
[amount] => 600
[amount_decimal] => 600
[billing_scheme] => per_unit
[created] => 1605157061
[currency] => usd
[interval] => day
[interval_count] => 30
[livemode] => 1
[metadata] => Stripe\StripeObject Object
(
[recurring] => true
[recurring_times] => -1
)
[nickname] =>
[product] => *** redacted ***
[tiers_mode] =>
[transform_usage] =>
[trial_period_days] => 30
[usage_type] => licensed
)
[price] => Stripe\StripeObject Object
(
[id] => *** redacted ***
[object] => price
[active] => 1
[billing_scheme] => per_unit
[created] => 1605157061
[currency] => usd
[livemode] => 1
[lookup_key] =>
[metadata] => Stripe\StripeObject Object
(
[recurring] => true
[recurring_times] => -1
)
[nickname] =>
[product] => *** redacted ***
[recurring] => Stripe\StripeObject Object
(
[aggregate_usage] =>
[interval] => day
[interval_count] => 30
[trial_period_days] => 30
[usage_type] => licensed
)
[tiers_mode] =>
[transform_quantity] =>
[type] => recurring
[unit_amount] => 600
[unit_amount_decimal] => 600
)
[quantity] => 1
[subscription] => *** redacted ***
[tax_rates] => Array
(
)
)
)
[has_more] =>
[total_count] => 1
[url] => /v1/subscription_items?subscription=*** redacted ***
)
[latest_invoice] => *** redacted ***
[livemode] => 1
[metadata] => Stripe\StripeObject Object
(
[tax_info] => {"trial_tax":"0.00","trial_tax_per":"0%","tax":"0.00","tax_per":"0%"}
)
[next_pending_invoice_item_invoice] =>
[pause_collection] =>
[pending_invoice_item_interval] =>
[pending_setup_intent] =>
[pending_update] =>
[plan] => Stripe\Plan Object
(
[id] => *** redacted ***
[object] => plan
[active] => 1
[aggregate_usage] =>
[amount] => 600
[amount_decimal] => 600
[billing_scheme] => per_unit
[created] => 1605157061
[currency] => usd
[interval] => day
[interval_count] => 30
[livemode] => 1
[metadata] => Stripe\StripeObject Object
(
[recurring] => true
[recurring_times] => -1
)
[nickname] =>
[product] => *** redacted ***
[tiers_mode] =>
[transform_usage] =>
[trial_period_days] => 30
[usage_type] => licensed
)
[quantity] => 1
[schedule] =>
[start_date] => 1605418061
[status] => trialing
[transfer_data] =>
[trial_end] => 1608010061
[trial_start] => 1605418061
)
[previous_attributes] => Stripe\StripeObject Object
(
[cancel_at] =>
[cancel_at_period_end] =>
[canceled_at] =>
)
)
[livemode] => 1
[pending_webhooks] => 1
[request] => Stripe\StripeObject Object
(
[id] => *** redacted ***
[idempotency_key] =>
)
[type] => customer.subscription.updated
)
[s2member_log] => Array
(
[0] => Ignoring this Webhook/IPN. The event does NOT require any action on the part of s2Member.
)
)