Add hosted checkout page for direct payment collection

[Smartdevs17]

Description

Build a hosted checkout page that merchants can link customers to for payment collection, supporting all payment methods with a responsive, optimized UI.

Acceptance Criteria

• Hosted checkout page with merchant branding
• Payment method selection (crypto, fiat, wallet)
• Real-time exchange rate display with lock option
• Mobile-optimized responsive design
• Post-payment confirmation with receipt download
• Abandoned checkout recovery via email reminder

Technical Scope

• frontend/app/forms/embed/[id]/page.tsx
• frontend/components/forms/FormRenderer.tsx
• backend/src/services/forms.ts
• Edge: browser back button handling, payment timeout, concurrent session checkout

[OmniZlatoon]

@OmniZlatoon has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Good day maintainer, please I am committed to my work on drips and I assure you the job completion on time .I would love to work on this issue maintainer. Please Assign me and I'll get the job done.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @OmniZlatoon to this issue.

[Ssoleed]

@Ssoleed has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Good day, please I am committed to my work on drips and I assure you the job completion on time .I would love to work on this issue maintainer. Please Assign me and I'll get the job done.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ssoleed to this issue.

[drips-wave]

Congratulations, @Ssoleed! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Ssoleed: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊