This is a project with great potential. It builds an invoice management application (with the name cBilling) for crypto transactions on the Cardano blockchain platform, invoice, send bill, export, QR code, PoS. It has effectively solved the challenge (cryptocurrency integrated into the application, number of downloads, number of uses, number of wallets connected to cBilling,…). It will impact and attract a large number of users with the audience being individual customers and retailers, e-commerce.

cBilling dApps, this is a proposal to create an application on Cardano's Blockchain platform to provide services related to e-commerce through transactions with cryptocurrencies, specifically in this case transactions associated with the ADA coin. To support retail and e-commerce platforms, cBilling builds a platform with very useful functions on it: Invoice builder, Payment services, Retail sale PoS… With the previous success of the proposal in the COTI challenge, the proposal continues to expand the features and inherits the achievements of the cPay project in Fund 7. It is true that there is a shortage of dApps developed on Cardano that support retail and e-commerce as well as online sales. The proposal poses a precise and highly impactful, widespread issue directly related to ADA transactions. The solution to the problem implemented at each stage is Developing APIs, libraries for accessing and creating databases for applications, developing applications, and integrating into e-commerce websites. , develop and improve functions, retail integration, and PoS points. The implementation solution is very clear and reasonable, the proponent has correctly identified the problem and the steps to be implemented in his project. In particular, the author also cites the important code of the project or the steps to build APIs tools with technical solutions (Authentication => API Response => API POST Fields). The functions of the dApp are also fully described and easy to understand. A variety of KPIs are identified and listed as The number of wallets that integrate and connect to the cBilling app. The number of downloads of cBilling application. The number of people who use cBilling applications regularly. The number of invoices generated. Prove that the proposal has evaluated the indicators that need to be implemented to be successful. In addition, the risks are also raised along with it, and the solutions are very reasonable. On top of that, the community creation campaign was also mentioned demonstrating the proposal to care about the users and commercialization of the cBilling product. You guys have come up with a highly impactful proposal and very sublime solutions, keep up the good work guys, I love this project.

Problem statement Too few tools and dApp from Cardano support retailers & eCommerce. ADA holders need an app for easily retrieving their transaction invoices. Solution to build an invoice management application for crypto transactions on the Cardano blockchain platform. Invoice, send bill, export, QR code, PoS. Cryptocurrency payments will be analyzed in depth and stored in the database of the cBilling software system. From these data analysis algorithms, the data will be refined and queried to serve the functions of the retail and e-commerce industries. Like accounting, sales invoices, taxes, exchange rates. This will help develop units and individuals using electronic payments, now there are many dapps built to analyze transactions of individual e-wallets for investment instead of serving. for commercial payments. I find it interesting to integrate crypto payments with PoS machines for restaurants and retailers. The proponent gives 4 risks with clear solutions, it would be better to add security information when users use this system

The ramifications the proposal brings are immense. The impact this could have on the payment methods through Cardano in a digital shopping-driven world of ours is huge. We have seen a lot of ideas that provides user gateways to pay through crypto coins, but this proposal goes a step further into providing the businesses to download invoices and other billings for various purposes such as taxation which was clearly something that is essential considering the adoption of crypto payments across e-commerce platform. On successful implementation of the proposal, something of this caliber would increase the rate of adoption and inturn traffic across the chains in turn boosting the overall value of the Cardano ecosystem. The proposer also makes points of how they plan to advertise their product through youtube and other channels, thus spreading the awareness of Cardano and its capability to a new untapped section of potential investors and users.

Having an easy way to integrate with ada payment for individuals and SMES are essential for Cardano as they are the majority. Personally, I support the creation of such app as proposed in this project. I believe this DApp will help to attract more users/investors to join Cardano ecosystem. The benefit this DApp brings to users and community is clear and undeniable.

The information about the project is provided very complete and detailed. This will facilitate the assessment of its success. Personally, I fully believe in the success of this project. This is a very valuable project, if successfully implemented, it will certainly bring a lot of value (creating a total solution for the retail, e-commerce, and online shopping industry based on transactions via cryptocurrencies), contributing to the outstanding development of the Cardano ecosystem. Thank you for a great proposal!

Governance and transparency in this proposal, Your team has a very methodical working process, in my opinion, you are applying the scrum model to managing this project. You have described very carefully the process of tracking the progress of the project, the working process of the team, and developing the product, it shows very science and logic in the work. I'm sure you've used a lot in your previous projects, which makes me feel secure when this project is funded. In addition to applying a great process, you also listed indicators to track the success of the project with milestones such as: Built a database system for cBilling dApp development, Complete the invoice forms, Build plugins for webshop platforms… Finally, here is the proposal that is part of a large project for you around the Cardano blockchain platform. cBilling is a key component of many of your major software platforms. I also clicked the links you provided to check out these very good projects and potential for the Cardano ecosystem. It is important that you have built a team with technical expertise working with the Cardano blockchain technology and are able to do even larger dApp projects. I love this proposal and support you to develop it for the catalyst community to use and enrich Cardano’s dApp ecosystem.

The proposal's final outcomes are well outlined and quantifiable and are based on a properly defined roadmap. The number of users, number of invoices generated, number of plugins created are all measurable and aligned with the expected metrics defined in the campaign brief. However, a few managerial metrics such as cost of quality, productivity, customer satisfaction index, and daily active user to monthly user ratio, customer retention ratio will probably provide more insight during the periodic audit process. The team however has been an active member and was successfully funded in F7 and also has several proposals in the F8 round. But with such a detailed game plan, detailed metrics probably broken down quarterly instead of the just final outcomes would have done the trick and made the entire proposal complete in every way. Hence, I personally feel 4 out of 5 for the auditability would do justice.

The proponent also states to use the scrum model to manage and track the progress of cBilling dApp development. There are also other metrics (Number of plugins built and deployed on E-Commerce platforms / Number of invoice forms created / Number of users, number of people downloading the application). The team also submitted 5 proposals at fund 8. The team also sponsored 2 projects at fund 7

The estimated cost is divided by small sub-tasks and software modules, which I think clear and tractable for 9-month project. the metrics to evaluate the project output are also clear and sufficient and I have no objections on that.