I am using a testing card 4242424242424242. I do not have its setting enabled - "Enable 3D Secure"
EDIT
Subcription Request Object
AddInvoiceItems: null
ApplicationFeePercent: null
BackdateStartDate: null
BillingCycleAnchor: null
BillingThresholds: null
CancelAt: null
CancelAtPeriodEnd: null
CollectionMethod: null
Coupon: null
Customer: "cus_IBn......."
DaysUntilDue: null
DefaultPaymentMethod: null
DefaultSource: null
DefaultTaxRates: null
Expand: null
ExtraParams: Count = 0
Items: Count = 1
Metadata: null
OffSession: null
PaymentBehavior: null
PendingInvoiceItemInterval: null
Plan: null
Prorate: false
ProrationBehavior: null
Quantity: null
TaxPercent: null
TransferData: null
TrialEnd: null
TrialFromPlan: null
TrialPeriodDays: null
Below is subscription object which I get as response after create subscription. if this helps
{ "id": "sub_absc....", "object": "subscription", "application_fee_percent": null, "billing_cycle_anchor": 1602504785, "billing_thresholds": null, "cancel_at": null, "cancel_at_period_end": false, "canceled_at": null, "collection_method": "charge_automatically", "created": 1602504785, "current_period_end": 1605183185, "current_period_start": 1602504785, "customer": "cus_IBn....", "days_until_due": null, "default_payment_method": null, "default_source": null, "default_tax_rates": [], "discount": null, "ended_at": null, "items": { "object": "list", "data": [ { "id": "si_IBn...", "object": "subscription_item", "billing_thresholds": null, "created": 1602504786, "metadata": {}, "plan": { "id": "price_1HZu....", "object": "plan", "active": true, "aggregate_usage": null, "amount": 1500, "amount_decimal": 1500.0, "billing_scheme": "per_unit", "created": 1602146656, "currency": "usd", "interval": "month", "interval_count": 1, "livemode": false, "metadata": {}, "nickname": null, "product": "prod_IAF....", "tiers": null, "tiers_mode": null, "transform_usage": null, "trial_period_days": null, "usage_type": "licensed" }, "price": { "id": "price_1HZ.....", "object": "price", "active": true, "billing_scheme": "per_unit", "created": 1602146656, "currency": "usd", "livemode": false, "lookup_key": null, "metadata": {}, "nickname": null, "product": "prod_IAFD1.....", "recurring": { "aggregate_usage": null, "interval": "month", "interval_count": 1, "trial_period_days": null, "usage_type": "licensed" }, "tiers": null, "tiers_mode": null, "transform_quantity": null, "type": "recurring", "unit_amount": 1500, "unit_amount_decimal": 1500.0 }, "quantity": 1, "subscription": "sub_IBnU........", "tax_rates": [] } ], "has_more": false, "url": "/v1/subscription_items?subscription=sub_IBn...." }, "latest_invoice": "in_1Hb.........", "livemode": false, "metadata": {}, "next_pending_invoice_item_invoice": null, "pause_collection": null, "pending_invoice_item_interval": null, "pending_setup_intent": null, "pending_update": null, "plan": { "id": "price_1HZu........", "object": "plan", "active": true, "aggregate_usage": null, "amount": 1500, "amount_decimal": 1500.0, "billing_scheme": "per_unit", "created": 1602146656, "currency": "usd", "interval": "month", "interval_count": 1, "livemode": false, "metadata": {}, "nickname": null, "product": "prod_IAFD1k.......", "tiers": null, "tiers_mode": null, "transform_usage": null, "trial_period_days": null, "usage_type": "licensed" }, "quantity": 1, "schedule": null, "start_date": 1602504785, "status": "incomplete", "tax_percent": null, "transfer_data": null, "trial_end": null, "trial_start": null }
subscription.latest_invoice.payment_intent.status
, or the PaymentIntent'slast_payment_error
? That should give a hint to why the payment failed and the subscription is incomplete. – karllekkosubscriptionOptions.AddExpand("latest_invoice.payment_intent");
for example for that reason. – karllekko