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When endpoint processes charge.failed it calls Contribution.getsingle. Action getsingle is more restrictive than get because when contribution does not exist then getsingle throw exception.

I have such history of Stripe donations:

1. customer.created
2. customer.updated
3. payment_method.attached
4. customer.source.created
5. charge.failed

On 5. step there is no contribution in CiviCRM yet. This is a single donation, not subscription.

My idea is such:

• use Contribution.get with trxn_id = chargeId
• when contribution exists, update status to Failed
• when contribution does not exists, create it with Failed status