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My PHP site ([login to view URL]) is fully built and live; the only piece still missing is a clean, reliable payment flow in US dollars. At the moment the checkout runs through PayPal only, and the percentages for each transaction type are already coded on the back end. What I now need is: • Convert the existing gateway logic so every purchase is processed strictly in USD, with correct rounding and fee calculations. • Enable mass-payment functionality that lets me trigger bulk payouts through the same gateway rules. The code should be written in a way that I can later plug in card processors or local-bank rails without rewriting everything. • Stress-test the flow (sandbox and live) and document any configuration steps so I can replicate them on staging or future servers. The project is entirely PHP/MySQL with no framework overlays, so native PHP, REST APIs, cURL, Webhooks and solid knowledge of PayPal’s Payouts endpoint will feel familiar. If you’ve integrated multi-currency logic before, please highlight that; I may add additional currencies later. Delivery is the updated, commented source plus a short read-me that shows how to toggle between live and sandbox keys and how to initiate a mass payout. Once it passes a live transaction test in USD, the job is done.
Project ID: 39717124
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Hello Yakov A., I’ve gone through your project description and feel confident that I’m a strong match for your needs. I recently completed a similar project just a month ago. My background covers PHP, Software Architecture, MySQL, HTML, cURL, Payment Gateway Integration, PayPal, REST API. Let's connect in chat so that we discuss this further. Thank You
$120 USD in 7 days
4.0
4.0
97 freelancers are bidding on average $169 USD for this job

Hi, I can convert it to a clean, reliable USD payment flow for you. I’ll ensure the mass-payment functionality is implemented to allow future integrations with card processors seamlessly. With over 7+ years of experience in PHP and a solid background in REST APIs, cURL, and PayPal’s Payouts endpoint, I can also perform stress tests on both sandbox and live environments to ensure everything runs smoothly. I’ll provide you with well-commented source code along with a short read-me document detailing configuration steps for live and sandbox keys. I’m familiar with multi-currency systems, so adding currencies later won’t be an issue. Let me know if you want to discuss this further! Best Regards, Priyanka
$250 USD in 3 days
8.3
8.3

Hi there, Your PHP site can have a clean, reliable USD payment flow with proper rounding, fee calculation, and mass-payout support through PayPal. I can update your gateway logic and ensure it’s modular for future card or bank integrations, fully tested in sandbox and live environments. With 8+ years of PHP/MySQL and payment gateway integration experience, I have handled multi-currency logic, PayPal Payouts, and REST API workflows for production systems. How I Can Help: USD Payment Conversion & Fee Handling: I will refactor your checkout to process all transactions strictly in USD, applying correct rounding and fees based on your existing logic. Mass Payout Integration: Implement a bulk payout flow using PayPal Payouts API, following your gateway rules, and make it modular for future payment rails. Sandbox & Live Testing: Stress-test the flow in both sandbox and live environments, ensuring reliability and documenting configuration for staging or future deployments. Clean, Commented Code & Documentation: Deliver fully commented PHP source code and a short read-me showing how to toggle sandbox/live keys and trigger mass payouts. If you could open the chat window to continue the conversation, that would be great for me. Warm regards Idefco Before we discuss the project, please note that the price is a placeholder only.
$140 USD in 7 days
8.7
8.7

I am highly qualified to do this job with high QUALITY USD Gateway & Mass Payments Setup ----- I am Passionate PHP/Full stack developer having rich experience with so many successful Tasks. I have some queries to give you accurate time and price Please ping me to get started and provide you great results. Thanks
$250 USD in 7 days
8.1
8.1

Hello Yakov, I understand you're looking to enhance your PHP site with a reliable USD payment flow and mass-payment functionality. Here's how I can help: • Convert existing gateway logic for USD processing with accurate fee calculations. • Implement mass-payment capabilities to streamline payouts while ensuring flexibility for future integrations. • Conduct thorough stress-testing and document configuration steps for seamless replication. I have extensive experience in PHP/MySQL, REST APIs, and PayPal integrations, including multi-currency setups. Let's discuss how I can get this done efficiently for your site! Have you considered which additional currencies you might want to include in the future? Thanks, Muhammad
$250 USD in 12 days
8.3
8.3

Sure, I can help you implement a clean, reliable USD payment flow and mass-payment functionality for your existing PHP/MySQL site, integrating with PayPal's Payouts endpoint ================================================================== Could you elaborate on the "percentages for each transaction type" and how these are currently applied, especially for the mass-payment functionality? ================================ I have extensive experience building robust backend systems using native PHP and MySQL, which sounds like a perfect fit for your existing setup. I'm very familiar with integrating payment gateways and handling complex transaction logic, including working with REST APIs, cURL, and webhooks.
$140 USD in 7 days
8.2
8.2

Drawing from my 7 years of experience and professional background, I can confidently say that your USD Gateway & Mass Payments Setup project is well within my wheelhouse. My expertise in HTML, MySQL, PHP and Software Architecture makes me the ideal candidate for this task. As your website is already built in native PHP without any framework overlays, you can count on me to ensure seamless integration of your desired payment flow logic. Delivering a clean, reliable payment flow in USD involves precise rounding and fee calculations which I have previously handled across multiple currencies. Moreover, leveraging my understanding of REST APIs, cURL, Webhooks and expertise in PayPal’s Payouts endpoint, I can make your current checkout system more efficient and incorporate mass-payment functionality for your bulk payouts. To warrant satisfaction, I promise unlimited revisions until you are completely happy with the final product which aligns perfectly with your vision. Additionally, I will stress-test the entire payment process both on sandbox and live environments to ensure absolute accuracy. Lastly, I will document each configuration step so that replicating them on staging or future servers becomes hassle-free for you. Henceforth, choose me because I aim not only for exceptional quality but also to establish a fulfilled clientele relationship through prompt delivery and professional finesse Regards, M Adeel
$140 USD in 2 days
7.9
7.9

Hello, I can start immediately. I can implement a clean, reliable USD-only payment flow for your PHP/MySQL site. I’ll update the existing PayPal gateway logic to handle accurate rounding, fee calculations, and enable mass-payouts through PayPal’s Payouts API. The code will be modular so future card processors or local-bank integrations can be added without rewriting. I’ll stress-test both sandbox and live environments, and provide clear documentation on toggling keys and initiating payouts. With strong experience in native PHP, REST APIs, cURL, and PayPal integrations, I can ensure your payment flow is secure, scalable, and production-ready. Let me know when you are available to discuss further > And when we can start work on the project Thanks Azad
$150 USD in 3 days
7.7
7.7

Dear Yakov A., I'm writing to propose on your "USD Gateway & Mass Payments Setup" project for SaleNumberOne.com. I understand your need to transition from PayPal-only to a robust USD payment flow, including accurate rounding, fee calculations, and essential mass payment functionality, all built on your existing native PHP/MySQL stack. My expertise in PHP, MySQL, REST APIs, cURL, and especially PayPal's Payouts endpoint, directly aligns with your requirements. I'm adept at integrating complex payment logic and have experience with multi-currency setups, which will be beneficial if you expand later. My approach will involve refactoring your current gateway to process strictly in USD, implementing a scalable mass-payment system, and ensuring the code is modular for future payment processors. I'll conduct thorough sandbox and live testing, providing well-commented code and a clear README for key management and payout initiation. I'm confident I can deliver a clean, reliable solution that passes your live transaction test. I'd appreciate the opportunity to discuss this further. Sincerely, Navneet
$250 USD in 7 days
7.7
7.7

Hi there, We have a team of PHP developers experienced in building and optimizing payment flows for live platforms like yours. We can update your existing checkout to process all transactions strictly in USD, ensuring correct rounding and fee calculations, while keeping the logic flexible for future integration with card processors or local bank rails. We can also implement the mass-payout functionality using PayPal Payouts, with clean, well-commented PHP code and sandbox/live testing to ensure everything works reliably. Full documentation will be provided, showing how to toggle between environments and initiate bulk payouts. Our team has integrated multi-currency logic in the past and can make the system scalable for additional currencies later if needed. We can share more details and discuss access once you’re ready. Thanks, Rahul A.
$250 USD in 7 days
7.9
7.9

I am confident I can successfully complete your project for your PHP site. I will convert the gateway logic to ensure all purchases are in USD, implement mass-payment functionality, stress-test the flow, and provide comprehensive documentation for future use. My experience with native PHP, REST APIs, cURL, and PayPal’s Payouts endpoint make me the perfect fit for this job. I have a proven track record of integrating multi-currency logic and am prepared to deliver the updated source code and read-me guide quickly and efficiently. Let's get your payment flow up and running smoothly!
$206.24 USD in 7 days
7.3
7.3

Hello There, I specialize in native PHP integrations and have solid experience with PayPal's Payouts API, REST-based payment flows, and multi-currency handling. I can refactor your existing gateway logic to ensure all transactions are processed strictly in USD with proper fee/rounding logic. I’ll also implement a scalable, modular mass-payout system that’s ready for future payment methods without code rewrites. I will stress-test both sandbox and live flows, and deliver: * Updated, well-commented PHP source code * A read-me with steps to switch keys and trigger payouts * Live transaction verification Let’s ensure your checkout and payout experience is both reliable and future-proof. Best regards, **Questions:** 1. Can you share the current PayPal integration code or access to the repo? 2. Are you using PayPal REST or Classic APIs currently? 3. Will payouts always be in USD, or should we prep for multi-currency now? 4. Do you have sandbox credentials and test users ready? 5. Is there a preferred deadline for completion?
$240 USD in 7 days
7.3
7.3

I'm Ayaz, a seasoned web developer with a strong grasp of PHP and MySQL. Having worked with varied CMSs like WordPress, Laravel, and CodeIgniter, I assure you of my ability to adapt and integrate your USD Gateway & Mass Payments system into your existing project. My understanding of REST APIs, cURL, Webhooks, and especially PayPal’s Payouts endpoint will be invaluable in making this transition smooth. I bring to the table not just relevant technical skills but also the crucial experience of multi-currency logic, which aligns with the possible expansion plan you mentioned with adding additional currencies later. My focus on clean code and attention to detail will ensure accurate rounding and fee calculations for all transactions in strict USD as per your requirement. Having an in-depth understanding of Linux and Windows servers adds another edge to my ability to stress-test your new payment flow in both sandbox and live environments comprehensively. I'll diligently document all configuration steps for easy replication on future servers too. Allow me to deliver this project efficiently so that you can finally have a reliable payment flow that supports bulk mass payments through the same gateway rules.
$250 USD in 3 days
7.1
7.1

Hi there. I am a full stack developer with experience in HTML, MySQL, PHP, PayPal, cURL, Software Architecture, Payment Gateway Integration and REST API. I have worked with many similar projects. I and my team of developers strive to give our best. Please contact to discuss in detail. Regards
$250 USD in 8 days
6.7
6.7

Hello, Thank you so much for posting this opportunity it sounds like a great fit, and I’d love to be part of it! I’ve worked on similar projects before, and I’m confident I can bring real value to your project. I’m passionate about what I do and always aim to deliver work that’s not only high-quality but also makes things easier and smoother for my clients. Feel free to take a quick look at my profile to see some of the work I’ve done in the past. If it feels like a good match, I’d be happy to chat further about your project and how I can help bring it to life. I’m available to get started right away and will give this project my full attention from day one. Let’s connect and see how we can make this a success together! Looking forward to hearing from you soon. With Regards! Abhishek Saini
$250 USD in 7 days
6.6
6.6

I've successfully integrated similar USD payment gateways, including mass payment solutions, using robust APIs and secure encryption protocols for high-volume transactions on e-commerce platforms, leveraging my expertise in PHP, MySQL, and secure coding practices. My previous project involved processing over 10,000 transactions daily with 99.99% uptime, exceeding client expectations. My approach will involve a phased implementation: API key integration, rigorous testing with your specific payment processor, and implementation of robust error handling and logging mechanisms using PHP's exception handling capabilities. This will ensure seamless and secure mass payment processing while maintaining data integrity and complying with PCI DSS standards. I'll also create detailed documentation for future maintenance and scalability. Ready to discuss integrating your chosen USD gateway and mass payment solution with your existing site? Could you share the specific payment processor you intend to use, so I can tailor my approach and provide a precise project timeline and cost estimate?
$204.67 USD in 21 days
6.4
6.4

With over X years of experience in web development, I'm confident that I can provide you with a premium solution to your USD gateway & mass payments requirements. I've reviewed your project and understand that you need a payment flow exclusively in USD, with bulk payouts capabilities and easy integration for future card processor or local bank rails. My extensive knowledge in native PHP, MySQL, REST APIs, cURL, and Webhooks combined with a deep understanding of PayPal’s Payouts endpoint means I am well equipped to handle your project. In fact, my experience extends to multi-currency integration which aligns perfectly with your potential future expansion plans. By choosing me, you'll get the updated, commented source codes along with a comprehensive read-me guide making system configuration straightforward. Plus, my dedication to flawless quality means I won't consider this project finished until it's fully tested and performing seamlessly both in live transactions and sandbox. I believe in working closely with my clients throughout the process, providing clear demos and documentation at every stage. My approach combines proven processes with creative flair and AI-driven innovation—something we could potentially leverage upon in your future projects. As a freelancer who believes in building lasting client relationships, I assure you not only top-notch performance but also ongoing support to address any post-delivery challenges.
$150 USD in 7 days
5.9
5.9

Hi, I’m a PHP developer experienced in payment gateway integrations and PayPal API (Payouts, REST, Webhooks). For your site, I’ll adjust the current gateway logic so all transactions process strictly in USD with correct rounding and fee handling. I’ll also implement a mass-payment module using PayPal Payouts, built on clean PHP/cURL code that can later support additional processors or currencies without major rewrites. Previously, I integrated PayPal Payouts for a marketplace platform where vendors received automated USD settlements. That project included currency conversion, transaction fee calculations, and sandbox/live testing—ensuring reliability before going live. I’ll bring the same approach here: stress-testing the flow, documenting configuration steps, and delivering clear code so you can toggle between sandbox/live keys and trigger payouts confidently. You’ll receive the updated source code plus a short README for replication on staging or future servers. Best, Joseph
$140 USD in 7 days
5.5
5.5

Greetings! I'm Aastha, a highly experienced PHP developer specializing in building reliable payment systems and gateways. I have worked on projects similar to yours, where I've integrated REST APIs and PayPal's Payouts endpoint into existing PHP sites for seamless multi-currency transactions. My deep understanding of native PHP, MySQL, REST APIs, cURL, and Webhooks will ensure that your payment system is robust, accurate, and efficient. Through this project, I'll make sure every purchase on your site is processed strictly in USD with precise rounding and fee calculations eliminating any scope for errors. Additionally, my attention to detail will shine through when enabling the mass-payment functionality for you. I'll build it in a way that you can effortlessly connect card processors or local-bank rails without rewriting your entire code. Importantly, my eight years of experience in the field assure you of zero-compromise security while preserving maximum functionality. To add on, my working style is consistent with your preference as I value client satisfaction over everything else. Therefore, I guarantee exceptional outp
$110 USD in 3 days
5.3
5.3

Hi, I have reviewed your job description and glad to say that i am senior-full stack developer, passionate about user experience, clean code, and accessibility. Most of all , I'm excited to help you build product for the website and solve interesting problems. I'll responsible for the entire development process, from the creation of the ideas, creating a development strategy, testing all the way to the final release of the website and further maintaince. Feel free to contact me back.
$300 USD in 15 days
5.3
5.3

Hi there, I can streamline your checkout by converting all flows to USD with accurate rounding, fee rules, and scalable payout logic. I understand you need reliable PayPal payments and bulk payouts handled cleanly for growth. ➞ I’ve completed similar PHP/PayPal REST projects, ensuring secure USD transactions and smooth mass payments. I can deliver tested, documented code ready for future gateway expansion. ⭕ I’ll handle it by: ✔️ Refactoring current gateway logic to USD ✔️ Adding PayPal Payouts API for bulk transfers ✔️ Sandbox/live stress-testing with clear docs ✔️ Iteration based on test results ✔️ Final validation & handover ➡️ Timeline & Budget: Preliminary estimate for now, final plan shared after full scope review. ➡️ Next Steps: Let’s connect to finalize and I’ll begin right after award. Thanks & Regards, Tejash J.
$140 USD in 7 days
5.4
5.4

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