Implement subscription invoice customization with branding

[Smartdevs17]

Context

Invoices need customization with branding.

Current Limitation

Invoices are generic.

Expected Outcome

• Invoice branding customization
• Template management
• PDF generation
• Invoice analytics

Acceptance Criteria

• Invoice branding customization
• Template management
• PDF generation with branding
• Invoice analytics
• Invoice preview
• Invoice API
• Invoice documentation

[dami080]

@dami080 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, I’d like to take on this issue. I have experience with similar tasks and can get started right away.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dami080 to this issue.

[morelucks]

@morelucks has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello,

I’m a smart contract and full-stack developer interested in contributing to this issue.

I have experience contributing through OnlyDust and have participated in Drips Wave 1, Wave 2, Wave 5, as well as the GrantFox beta campaign.

My technical background includes Rust, Soroban, Cairo, Solidity, and TypeScript, with a focus on building secure, scalable, and maintainable blockchain applications.

Based on the scope of this issue, I’m confident I can deliver a complete and well-tested solution within 24 hours of assignment. I prioritize clean code, clear documentation, and efficient implementation.

I’d appreciate the opportunity to contribute and help move this issue forward.

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

[drips-wave]

Congratulations, @morelucks! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @morelucks: 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 🌊