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Preciso de um script focado em Processamento de pagamento para o meu site. A solução deve: • Gerar e capturar transações de forma segura (criptografia, tokenização ou equivalente). • Validar valores, moeda e dados do comprador antes do envio ao gateway. • Exibir mensagens claras de sucesso ou erro e registrar logs para auditoria. • Ser fácil de integrar a páginas PHP/JavaScript já existentes, com instruções passo-a-passo. Ainda avalio qual gateway ou método usar; aceito sugestões que incluam cartão de crédito/débito, PayPal ou até transferência bancária, conforme viabilidade técnica e custo. Entrego acesso ao servidor de testes e às chaves da conta assim que definirmos o provedor. No final, preciso do código fonte bem comentado, um arquivo README explicando instalação e um breve vídeo (ou screenshots) mostrando o fluxo concluído. Se você domina integrações de pagamento e boas práticas de segurança web, vamos conversar!
Project ID: 40484074
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18 freelancers are bidding on average $47 USD for this job

Hello, With my extensive experience in website development and specialisation in web security, I am confident that I am the perfect fit for your secure online payment script project. Over the past 8 years, I have been delivering impeccable web solutions that prioritize not just functionality, but also robust security. HTML, JavaScript, and PHP are my strongholds; perfect for seamlessly integrating your existing pages. When it comes to payment integrations, I understand that security is of paramount importance. My vast knowledge in web security ensures the implementation of encryption mechanics such as tokenization that will protect both your customer's data and your business. Additionally, I have the adaptability and technical abilities necessary to work with multiple gateways including credit/debit cards, PayPal and even bank transfers. In line with your requirements, I assure you of a well-commented source code along with an explanatory README file to facilitate future updates. And to further eliminate any confusion or concerns you might have, I can provide you a brief video or screenshots demonstrating the complete payment flow. With me by your side throughout the project lifecycle, you can rest easy knowing that your digital presence is fortified with premium quality and top-notch security solutions. Thanks!
$30 USD in 1 day
7.9
7.9

Hi, I build modern JavaScript apps end to end — React/Vue on the front and Node/Express (or Nest) on the back, in TypeScript where it helps. I focus on responsive, fast UIs, clean component structure, and reliable APIs, no page-builder shortcuts. I'll lock down the scope and key user flows first, then ship in reviewable increments with working previews so you're never guessing about progress. Performance, state management, and clean code are the defaults, not extras. To give you an accurate plan, could you tell me [the core feature] and whether this is a fresh build or an existing codebase I'd be extending? Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.
$24 USD in 1 day
7.6
7.6

Hi! My name is Marjan and I'm here to offer you my services as a skilled applicant with over a decade of experience working on Freelancer.com. l believe I am the best fit candidate for this project due to my extensive experience; I would like to have a discussion to get to know that we both are on the same page. Once the scope will be locked, I will start working on it right away.
$200 USD in 7 days
6.9
6.9

Dear Client, Hello dear! I’m Md. Toriqul Islam, an experienced full-stack developer specializing in payment gateway integrations, secure web applications, and API development with 10+ years of experience. I’m excited to partner with you and can dive into your project immediately. I understand you need a secure payment processing solution for your website, including transaction validation, gateway integration, error handling, audit logging, and clear installation documentation. I have successfully integrated various payment systems and can recommend the most suitable provider based on security, cost, and business requirements. I have rich experience in payment processing and web security. I am skilled in PHP, JavaScript, REST APIs, Stripe, PayPal, database management, and secure transaction workflows. Feel free to share additional details or ask questions. I’m happy to refine my approach to fit your needs. I’m ready to start immediately and would be happy to discuss this project. Looking forward to hearing from you. Best regards, Md. Toriqul Islam
$10 USD in 3 days
6.2
6.2

As a seasoned Web Engineer with more than 10 years of experience, I can confidently say that I have the profound knowledge and skills required to deliver a robust and secure online payment script for your website. Over the years, I've successfully integrated, developed and maintained numerous payment gateways into different types of websites, be it PHP or JavaScript, I can handle them all. Moreover, my expertise in HTML, JavaScript and PHP makes me proficient in generating and capturing transactions securely using cutting-edge methods that ensure data encryption, tokenization and more. One of the valued assets that sets me apart from other candidates is my familiarity with good web security practices. I have an in-depth understanding of how to validate data before sending it to the gateway - ensuring seamless and secure payment processing whilst maintaining necessary logs for auditing purposes. A well-documented codebase with accompanying instructions on installation plus a video walkthrough to show you how everything works will be delivered at the end of our project. I believe in providing holistic solutions that not only meet your current requirements but are scalable enough to accommodate any future changes or additions. Coming from my background of valuing quality, stability and clear communication, I assure you that you will get nothing short of exceptional results if chosen for this project.
$10 USD in 1 day
6.1
6.1

Hi, posso integrar PawaPay no seu site com pagamentos seguros e prontos para produção. Vi que precisa validação de dados, criptografia, logs e integração PHP/JS, e já implementei gateways de pagamento e APIs financeiras em projetos full stack. Vou criar validação, webhooks, logs de auditoria e integração simples com seu sistema. Você quer começar só com PawaPay ou já incluir cartões e PayPal na primeira versão? Best Regards, Fizza Nadeem K
$30 USD in 4 days
5.9
5.9

Hello, I came across your Script de Pagamento Online Seguro and I am very interested in working with you. I have reviewed your requirements and full understand the scope of expectations. I specialize in PHP, Website Design, HTML, and have successfully delivered similar projects before. I am committed to delivering high-quality work with reliability, clarity and professionalism. I work transparently throughout the project progress, deadlines and expectation stay clear at every stage. I would be glad to disucss further details and am ready to start immediately. Looking forward to hearing from you. Regards. Anum
$30 USD in 1 day
5.8
5.8

A decisão de segurança mais importante num script de pagamento é uma que muita gente erra: o número do cartão nunca deve tocar o seu servidor. O caminho seguro é a tokenização do lado do cliente - o cartão vira um token no navegador, pelo próprio gateway, e o seu código só lida com esse token. Isso é mais seguro e ainda te mantém fora do escopo pesado de PCI-DSS; criar a sua própria "criptografia" de dados de cartão é justamente o caminho perigoso, que joga toda a responsabilidade de um vazamento no seu colo. Dois pontos completam a segurança: o valor e a moeda eu valido no servidor contra os seus próprios registros, nunca confiando no preço que vem do navegador, que o usuário pode adulterar; e a confirmação do pagamento vem do webhook do gateway, não do redirect do cliente - é isso que vai para o seu log de auditoria, com o ID da transação. Sobre o gateway: para cartão, o Stripe tem a tokenização mais limpa; se você precisa de PIX e métodos locais, Mercado Pago ou PagSeguro cobrem isso. Recomendo conforme o seu país e os métodos que quer. Entrego com o código comentado, o README e o vídeo do fluxo.
$20 USD in 7 days
4.5
4.5

Olá, posso criar um script seguro de processamento de pagamento para seu site em PHP/JavaScript, com validação, integração ao gateway, mensagens claras e logs de auditoria. Tenho experiência com integrações de pagamento, APIs, webhooks, segurança web, tokenização, validação de valores/moeda e fluxos de checkout. Posso recomendar Stripe ou PayPal para começar, dependendo do país, taxas e métodos desejados. Também posso estruturar o código para aceitar transferência bancária ou outros gateways depois. Vou entregar o código fonte comentado, instruções passo a passo em README, ambiente de teste configurado e evidências do fluxo funcionando com sucesso/erro. A integração será feita de forma simples para encaixar nas páginas PHP/JavaScript existentes. Estou pronto para começar. Best, Smit
$20 USD in 1 day
2.1
2.1

Maputo, Mozambique
Member since Jun 1, 2026
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