Add integration test for webhook delivery payload containing correct event type field

[Chucks1093]

Summary

The trade webhook delivery payload must contain an event_type field set to either buy or sell matching the trade that triggered it. An integration test should confirm the field is populated correctly for both event types.

Scope

• Register a webhook for both buy and sell events
• Simulate a buy trade and assert the delivered payload contains event_type: 'buy'
• Simulate a sell trade and assert the delivered payload contains event_type: 'sell'

Acceptance Criteria

• Buy trade delivers payload with event_type: 'buy'
• Sell trade delivers payload with event_type: 'sell'
• No other event_type value appears in the payload

ETA: 12 hours

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Coordinate on Telegram

[Ayomide-codex]

@Ayomide-codex has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please assign, I’d love to work on this

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[Benedict315]

@Benedict315 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello please assign

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[meem08]

@meem08 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi please assign this issue to me

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[Seunfunmi-319509]

@Seunfunmi-319509 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer I will like to work on this issue

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[Ajibose]

@Ajibose has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

kindly assign this to me

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