Subscriptions: webhook or event for renewal failure

[aji70]

Description
The goal is to notify when a subscription renewal fails. Emit internal event or call webhook when renewal fails (payment or contract revert). Consumer can notify user or update UI. Do not block subscription flow on webhook.

Tasks

• Define renewal-failure event or webhook payload
• Emit or call on renewal failure in subscription flow
• Add test or manual check that event fires on failure

Acceptance Criteria

• Renewal failure triggers event or webhook
• Payload includes subscription id and reason if available
• Tests pass

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[Yusufolosun]

@Yusufolosun has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Good day Maintainer
I would love to take on this issue, I've reviewed the issue description and I can implement a maintainable solution fast.
I'm active and i respond and react to feedback fast

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[Mathews-25]

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Hello maintainer I would like to work on this issue

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[dreamgene]

@dreamgene has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

kindly assign

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