Feat/payment add integrations and response payload

[deveasyclick]

This PR introduces major improvements to the payment flow by migrating from Interswitch to Paystack, alongside several cleanup and refactor tasks to simplify the codebase and improve maintainability.

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What's New / Changed

🔌 Payment Integration Migration

• Fully migrated payment processing from Interswitch to Paystack.
• Updated all related dependencies, environment variables, and payment flow logic to support the new provider.
• Ensures a more reliable and developer-friendly payment experience.

🧾 Billing Improvements

• Fixed bill item lookup logic by correctly using the provider’s name property.

🧹 Refactors & Cleanup

• Removed the unused Sidebar component from BillPayPage.
• Removed debug console.log statements and outdated commented-out code.

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Why This Matters

This upgrade modernizes the payment pipeline, reduces legacy complexity, and improves overall DX. Paystack integration also positions the system for more reliable and maintainable future enhancements.

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Testing Notes

• Verify that Paystack payments initialize and complete successfully.
• Test billing flows to ensure correct provider lookup.
• Confirm that UI displays correctly without the Sidebar component.

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Project	Deployment	Preview	Comments	Updated (UTC)
billpay	Ready	Preview	Comment	Nov 24, 2025 6:20pm