Webhook Support for Payment Events

[KuchiMercy]

closes #222

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[Cedarich]

@KuchiMercy Please fix

Run pnpm run lint

@quickex/[email protected] lint /home/runner/work/QiuckEx/QiuckEx/app/backend
eslint "{src,test}/**/*.ts"

/home/runner/work/QiuckEx/QiuckEx/app/backend/src/notifications/tests/webhook-provider.unit.spec.ts
Error: 202:35 error Require statement not part of import statement @typescript-eslint/no-var-requires

/home/runner/work/QiuckEx/QiuckEx/app/backend/src/notifications/tests/webhook-service.unit.spec.ts
Error: 6:3 error 'NotificationEventType' is defined but never used @typescript-eslint/no-unused-vars
Error: 39:10 error Unexpected any. Specify a different type @typescript-eslint/no-explicit-any
Error: 44:10 error Unexpected any. Specify a different type @typescript-eslint/no-explicit-any
Error: 53:13 error 'result' is assigned a value but never used @typescript-eslint/no-unused-vars

/home/runner/work/QiuckEx/QiuckEx/app/backend/src/notifications/tests/webhooks.controller.e2e-spec.ts
Error: 15:9 error 'mockWebhook' is assigned a value but never used @typescript-eslint/no-unused-vars

/home/runner/work/QiuckEx/QiuckEx/app/backend/src/notifications/providers/notification-provider.interface.ts
Error: 9:3 error 'WebhookDeliveryResult' is defined but never used @typescript-eslint/no-unused-vars

/home/runner/work/QiuckEx/QiuckEx/app/backend/src/notifications/webhook.service.ts
Error: 7:3 error 'NotificationEventType' is defined but never used @typescript-eslint/no-unused-vars

✖ 8 problems (8 errors, 0 warnings)

 ELIFECYCLE  Command failed with exit code 1.
Error: Process completed with exit code 1.

[Cedarich]

LGTM