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I run an online platform where clients create and manage customer-engagement SMS campaigns. I now need PayPal Checkout woven seamlessly into the site so users can pay for their messaging credits without ever leaving the flow of campaign creation. Here is what I’m after: • Add the latest PayPal Smart Buttons to the purchase page that sells SMS credit bundles. • Support both Sandbox and Live modes so I can test before going public. • Once a transaction is authorised, instantly credit the buyer’s account and trigger our existing confirmation email/SMS. • Capture and store PayPal transaction IDs in my MySQL database; I’ll provide the table schema. • Make sure the integration works smoothly on desktop and mobile, and that errors (cancellations, declines, time-outs) are handled gracefully. Tech stack you’ll touch: PHP 8, JavaScript (vanilla), and a REST-style backend API. If you prefer using the official PayPal PHP SDK or JavaScript SDK, great—just keep the code clean and well-commented. Acceptance criteria A purchase in Sandbox mode: 1. Shows PayPal pop-up, completes payment, and redirects to the success page. 2. Credits appear in the user account instantly. 3. Transaction record is written to the database with status “COMPLETED.” Once that works, we’ll flip the switch to Live mode. I’ll supply server access, API keys, and sample user accounts as soon as we start. Looking forward to a robust, tidy integration that lets my users pay with confidence.
Project ID: 40368049
69 proposals
Remote project
Active 8 days ago
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69 freelancers are bidding on average $26 USD for this job

Hi there, As a specialist who understands the urgency of frictionless payments during campaign creation, I’ll weave PayPal Smart Buttons into your PHP 8 + vanilla JS stack so buyers can top up SMS credits without breaking their flow. I’ve built PayPal integrations that support Sandbox and Live modes, handle cancellations and timeouts gracefully, and instantly credit user accounts while triggering your existing confirmation emails/SMS. I’ll capture PayPal transaction IDs in MySQL using your provided schema and keep the code clean, well-commented, and easy to maintain. What you’ll get: - Latest PayPal Smart Buttons on the purchase page, responsive for desktop and mobile. - Robust sandbox testing workflow plus a smooth switch to Live with minimal risk. - Atomic crediting on authorization and reliable confirmation messaging. - Durable transaction logging with status tracking in your DB. - Clear error handling and user feedback for declines, cancellations, or timeouts. I’ve shared an initial estimate based on your description, and once we go over a few technical details, I’ll confirm the exact cost and delivery schedule. Asad - I’ll align with your REST-style backend and keep the integration cohesive with your existing API endpoints. What is the exact MySQL table schema for storing PayPal transaction IDs and status, and do you already have a webhook listener in place for asynchronous payment updates? Best regards, Asad
$30 USD in 3 days
8.2
8.2

Hi, Thanks for providing clear requirements about to integrate Paypal Smart button so User can buy credits on same page without losing workflow and credit will add immediately into buyer's account. I will handle proper success and cancel workflow and maintain data in MYSQL database based on transaction. I have 7 plus years experienced in PHP LARAVEL JAVASCRIPT JQUERY AJAX PAYMENT INTEGRATIONS API INTEGRATIONS and much more I would like to work with you in this PayPal payment method integration work. Thanks
$30 USD in 1 day
8.3
8.3

Hello, I will integrate PayPal Smart Checkout into your platform, enabling seamless credit purchases with instant account updates and secure transaction handling. I have experience integrating PayPal Smart Buttons with PHP backends, handling payment flows, database logging, and real-time updates. I have worked on similar systems where payments trigger immediate account credits and notifications. My approach is to implement PayPal JS SDK for the frontend, verify transactions via backend API, store transaction IDs securely, and handle all success/error states cleanly across devices. I will support both Sandbox and Live modes with well-documented code. The Bid amount is subject to change and will be finalized after a complete project discussion. I can deliver a robust, production-ready integration quickly. Let’s connect and get this running. Regards, Smile Mittal
$30 USD in 2 days
8.1
8.1

Hi there, It looks like the main issue is not just adding PayPal, but making sure payments happen smoothly inside your campaign flow without breaking the user experience — plus correctly handling credits, database records, and edge cases. I can help you implement PayPal Smart Buttons in a way that: Instantly credits users after successful payment Safely stores transaction IDs in your MySQL DB Handles failures (cancel, timeout, decline) cleanly Works perfectly in both Sandbox and Live modes I’ve worked with PHP + REST APIs and payment integrations, so I’ll keep the code clean, reliable, and easy to maintain. Let’s get this integrated properly so your users can pay without friction Thanks Sachin
$30 USD in 2 days
7.5
7.5

We can assist with integrating PayPal Checkout into your online platform. We understand the need to seamlessly add PayPal Smart Buttons for SMS credit purchases, support sandbox and live modes, instantly credit user accounts upon successful transactions, capture transaction IDs in MySQL, and ensure graceful error handling across devices. Experience: We have 18+ years of experience in web development. We are familiar with PHP, vanilla JavaScript, REST API integration, and MySQL database management. We will utilize the official PayPal PHP SDK for a robust and well-commented integration.
$80 USD in 1 day
7.5
7.5

Hello, I have carefully reviewed your project requirements and have a clear understanding of what needs to be accomplished. I can complete this project within 1-2 days, ensuring high-quality results and attention to detail. I have previously worked on similar projects which enables me to deliver efficient and reliable solutions. You can expect: * Clean, maintainable, and well-documented code * Timely communication and updates * Free lifetime maintenance and support I follow a client satisfaction-first approach and will only request payment after successful project completion—no upfront payment required. I would be glad to discuss your requirements further and get started. Best regards, Preeti
$30 USD in 2 days
6.5
6.5

Hello there, I can help you integrate PayPal Checkout into your platform. I have solid experience with PayPal and have worked on 100+ payment gateway integrations. I’ll add PayPal Smart Buttons, handle Sandbox and Live modes, verify payments, credit user accounts instantly, store transaction IDs in MySQL, and ensure smooth flow with proper error handling across desktop and mobile. Quick questions: 1. Do you have PayPal API credentials ready? 2. Is your credit system already set up via API? 3. Do you want server-side payment verification? I’m ready to start immediately, let’s connect and get this live fast.
$20 USD in 7 days
6.5
6.5

Hi, With over 10 years of experience, I specialize in integrating PayPal Smart Buttons with PHP 8 and MySQL. I will implement a seamless checkout that keeps users in the flow while processing payments securely in Sandbox and Live modes. I will ensure successful transactions instantly credit the user account, trigger your notifications, and log the Transaction ID to your database with a "COMPLETED" status. My code will be clean, well-commented, and handle all errors gracefully. I am ready to set up the API and start testing immediately. Best regards, Hitesh Goyal
$30 USD in 3 days
7.0
7.0

Being a seasoned Full Stack Developer with over a decade of experience, I've had countless opportunities to master the skills needed for even the most complex of projects and that includes API Development, Payment Gateway Integration, and working with JavaScript and PHP. This makes me an excellent fit for your project involving PayPal Checkout integration into your bulk SMS website. I've successfully managed over 100 projects just like this and have consistently delivered robust, scalable, and secure solutions. My extensive experience extends beyond just technical knowledge. Just like you, I focus on building long-lasting solutions that enable business growth, drive results, and enhance user experience. This aligns perfectly with your aims for the project. Additionally, my proficiency in handling different tech stacks including PHP and JavaScript guarantees you clean, well-commented code which is highly maintainable. Moreover, you can expect swift response time along with constant and clear communication throughout our collaboration. Considering the sensitivity of payment transactions, it is crucial to work with a trustworthy professional who values the security of information above all else. With me as your partner, you can rest easy knowing your PayPal transactions will be handled smoothly while duly taking care of any errors or timeouts that may arise. Let's turn your vision into a tangible reality together!
$99 USD in 7 days
6.3
6.3

I am ready to start work on it right now. I can help you integrate PayPal Checkout smoothly into your SMS campaign platform so your users can purchase credits without interrupting their workflow with excellent code flow of execution. Let's have a chat/call session with you for further discussion. To looking forward for your positive response to start working on it. Thanks and regards.
$30 USD in 1 day
6.0
6.0

With over 13+ years of experience developing full-stack applications and APIs, I assure you a thorough, high-quality integration of PayPal's Smart Buttons. Supporting both Sandbox and Live modes will be a breeze, as will crediting users' accounts instantly post-transaction authorization. With your production-grade web app and REST-style backend API running PHP 8, JavaScript (vanilla), I am indeed the best fit for this task. I pride myself on creating robust, scalable, and maintainable systems - key skills that have been tested and proven in my previous projects. My familiarity with the official PayPal PHP and JavaScript SDK further guarantees a seamless integration aligned with your desired tech stack. Your satisfaction matters deeply to me. Thus I promise to handle errors gracefully, ensuring smooth desktop and mobile functionality. Lastly, my secure application design expertise matches perfectly with this project. With payment gateway integrations being one of my specialties, I assure you that your users’ data will be encrypted and transactions protected. Partner with me for a tidy, well-commented code delivery that lets your users pay with complete confidence.
$20 USD in 7 days
6.7
6.7

Hi There The key here is making PayPal feel native to your credit-purchase flow, not bolted on after the fact. I can integrate the latest PayPal Smart Buttons into your PHP 8 and JavaScript setup, support both Sandbox and Live modes, write completed transaction IDs to MySQL, and trigger your existing crediting plus confirmation logic instantly after successful payment. I focus on clean, maintainable integrations with proper handling for cancellations, failed payments, and timeout scenarios so the user experience stays smooth on both desktop and mobile. Before going live, I’ll make sure the full Sandbox flow is working exactly to your acceptance criteria from popup to redirect, credit update, and completed transaction record. best regards Waqas A.
$20 USD in 7 days
6.3
6.3

Hi there, I understand you need PayPal Smart Buttons integrated into your PHP 8/vanilla JS SMS campaign platform so users buy SMS credit bundles without leaving the campaign flow. I’ve built payment flows that immediately update user balances and write transaction IDs into MySQL while supporting sandbox/live toggles, so I’m a precise fit. - Add PayPal Smart Buttons (JS SDK) to the purchase page with Sandbox/Live toggle and clean comments. - Implement server-side order creation/verification using PayPal PHP SDK or REST calls, write PayPal transaction IDs to your MySQL table, and return credit updates to the user. - Trigger your existing confirmation email/SMS via your REST-style backend upon payment capture and update user's credit balance immediately. - QA: cross-device testing, graceful error handling (cancellations, declines, timeouts), and a rollback/validation path to ensure minimal risk. Skills: ✅ PayPal ✅ PHP 8 ✅ JavaScript (vanilla) ✅ REST API / webhook integration ✅ MySQL / transaction logging / reliability Certificates: ✅ Microsoft® Certified: MCSA | MCSE | MCT ✅ cPanel® & WHM Certified CWSA-2 I’m available to start and can complete a sandbox-ready integration first. Do you have an existing order-create endpoint and the MySQL table schema ready, or should I implement order creation and schema mapping during the job? Price: $30 , Delivery: 1 day Best regards,
$30 USD in 1 day
5.8
5.8

Hello there, I’m a reliable and detail-oriented professional with experience delivering high-quality results across a range of projects, ensuring accuracy, efficiency, and clear communication throughout. I focus on understanding your exact requirements and providing solutions that are practical, well-structured, and ready for immediate use or implementation. I can start right away and deliver within your timeline while maintaining strong attention to quality and consistency.
$20 USD in 1 day
5.7
5.7

My service : https://www.freelancer.com/service/paypal_api/integration-with-paypal-rest-api About this service Authenticate with OAuth 2.0. Get a PayPal button and credit and debit card. The Orders v2 API connects PayPal payment services with merchant and partner applications such as websites, software applications, and other channels. The API endpoints provide a layer of abstraction from the payments and enable a secure and seamless integration experience.
$30 USD in 7 days
5.6
5.6

My name is Craig and I'm just the developer you need to create a seamless, efficient PayPal Checkout for your Bulk SMS Website. With over 5 years of experience specialising in PHP, Node.js, Vue.js, and C# programming, I have the versatility to meet all your development needs and more. Having worked extensively with JavaScript, MySQL, PHP, REST API; I am particularly adept at integrating APIs like PayPal smoothly into existing systems. My strong background in full-stack web development and web scraping means that I possess the know-how to handle your stack (PHP 8, JavaScript (vanilla) and a REST-style backend API) with precision. Importantly, I bring a result-focused approach designed to not just meet but exceed client expectations. That's why I see this project not only as another job but as an opportunity to contribute meaningfully to a successful user-experience focused platform. With me on board, you're guaranteed a robust, well-documented integration that delivers enhanced functionality and gives your users the confidence they need.
$30 USD in 1 day
4.9
4.9

I already see a clean way to execute this. I specialize in payment integrations for SaaS and marketing platforms, including PayPal Checkout on subscription-style and usage-based tools. I’ve worked with campaign and messaging platforms before, so I understand how important smooth, reliable payments are for clients running time-sensitive SMS campaigns. You want your users to be able to pay quickly and securely via PayPal, without friction, and have that payment reliably unlock or top up their SMS usage. In simple terms: seamless checkout, clear confirmation, and no headaches for you or your customers. My approach would be to integrate PayPal Checkout in a way that matches your existing flow, properly handle success/cancel/webhook events, and ensure payment status ties cleanly into your SMS credits or plans so everything stays in sync. Quick question: are you currently using a specific tech stack or framework for your bulk SMS platform that I should align with? Lets chat more about your project, worst case you walk away with a free strategy session Regards
$20 USD in 7 days
4.7
4.7

As a seasoned full-stack developer with a specific focus on mobile and backend service development, I have the ideal skill set to integrate PayPal Checkout into your bulk SMS website seamlessly. Whether it's adding the latest PayPal Smart Buttons, supporting Sandbox and Live modes, or crediting buyer's accounts instantly, rest assured that I will deliver a solution that not only meets your requirements but also ensures a smooth and secure payment process for your users. I have vast experience in working with APIs and databases such as MySQL, which aligns perfectly with your project's demands of capturing, storing transaction IDs in the database. My knowledge of PHP 8, JavaScript, and REST-style API further compliments this requirement. Moreover, my thorough understanding of web development technologies combined with my proficiency in mobile app development will translate into an integration that is not only desktop-friendly but also optimized for mobile use. With my help, you can have a robust system that handles errors gracefully and guarantees excellent user experiences across platforms. Let's get started and deliver an integration that makes paying for messaging credits as smooth as sending an SMS!
$10 USD in 1 day
4.2
4.2

With a solid background in web development, API management, and an extensive understanding of JavaScript and PHP (including the latest PHP 8), I am confident that I'm the right candidate to seamlessly integrate PayPal Checkout into your bulk SMS website. My goal is to build websites that don't just have appealing features but are robust, high-performing, and user-centric, which aligns perfectly with your project needs. I am well-versed in integrating different payment gateways into web platforms because I understand the importance of a smooth and secure payment process for users. Your project's added requirement of supporting both Sandbox and Live modes smoothly is no issue; I always leave room for testing and completion of tasks before taking projects live. Moreover, my experience with different REST-style backend APIs sets me apart; it gives me confidence in handling technical matters like capturing PayPal transaction IDs efficiently and storing them in your MySQL database as per your given schema. With my dedication to clean code and rigorous commenting, you can rely on me to deliver future-proof solutions that you can manage with ease. Looking forward to working with you!
$20 USD in 7 days
4.1
4.1

At Paper Perfect, we pride ourselves not only on our team's technical acumen but also our ability to listen to client needs and deliver bespoke solutions that fit those needs. Your request for a seamless PayPal integration into your Bulk SMS site aligns with our areas of expertise. We have extensive knowledge and hands-on experience working with APIs, JavaScript, PayPal API, and PHP — precisely the skills required to achieve your PayPal Checkout goals. Moreover, we fully understand the importance of testing and ensuring a smooth user experience in both Sandbox and Live modes before flipping the switch. We'll make certain the integration works impeccably on both desktop and mobile interfaces, with no room for error. We’ll also be diligent in capturing and storing PayPal transaction IDs in your MySQL database as per your table schema. It would be an honor to bring your vision to life by enabling swift, secure, and hassle-free payment flow for your users. With us managing this crucial aspect of payment integration, you can have peace of mind knowing that your clients will be able to purchase SMS credits effortlessly and receive timely confirmations. Choose Paper Perfect for a meticulous approach that prioritizes functionality without sacrificing clean code or timely delivery.
$20 USD in 7 days
3.7
3.7

Nairobi, Kenya
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Member since Jul 20, 2015
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