Bulb’s Value Driven Transformation

Smart Pay as You Go

From Legacy to Innovation: Making Energy Payments Smarter

In a world of evolving energy needs and payment preferences, Bulb, a UK-based energy provider, embarked on a transformative journey to enhance the way customers manage their energy payments. Let us delve into Bulb’s strategic move of introducing a Smart Pay as You Go system, highlighting the challenges, opportunities, approach, and the remarkable outcomes that followed. Traditionally, energy consumers in the UK had two primary payment options: direct debit or pay as you go. Pay as you go involved manual top-ups, often requiring customers to visit physical locations, leading to inconvenience and inefficiency. This endeavor presented several significant challenges:


  • Security Concerns

    The paramount concern was to ensure the highest level of security to safeguard sensitive customer data. Energy billing involves confidential financial information, and any data breaches could have severe consequences for both customers and the company. Meeting stringent security standards was non-negotiable.

  • User Experience

    Balancing security with a smooth user experience posed a unique challenge. While stringent security measures were crucial, they couldn't come at the expense of user-friendliness. The app needed to be intuitive and efficient to ensure customers could easily manage their energy payments without frustration.

  • PCI Compliance

    The payment processing system had to be fully compliant with Payment Card Industry Data Security Standard (PCI DSS) requirements. Achieving PCI compliance was essential to instill trust among customers and avoid potential penalties and liabilities associated with non-compliance.

  • Adding Value Proposition

    The payment processing system had to be fully compliant with Payment Card Industry Data Security Standard (PCI DSS) requirements. Achieving PCI compliance was essential to instill trust among customers and avoid potential penalties and liabilities associated with non-compliance.


Customer Growth

Bulb estimated that by offering a smart pay as you go product, they could potentially grow their customer base by over 300,000, with people already signed up on the waitlist.


Customers found it time-consuming and inconvenient to visit physical shops to top up their meters. Enabling online top-ups via the app would greatly enhance convenience.

Real-time Monitoring

Customers with legacy pay as you go had to constantly monitor their physical meters to avoid running out of credit. Allowing them to check their balance online from anywhere would simplify the process and prevent energy disruptions.

Our Designing Approach

Bulb’s Pay as You Go Revolution

Selection of PCI-Compliant Provider

To address the pressing concern of data security and compliance with industry standards, we made a careful and informed choice by selecting Stripe as the payment gateway provider. This step includes:

  • Extensive research to identify a secure and PCI-compliant payment partner.
  • Careful evaluation of Stripe, a renowned payment gateway known for its security measures.
  • A strong emphasis on aligning with Bulb’s value proposition of trust and security.

Integration Planning

To ensure a smooth integration process and compatibility across both Android and iOS platforms, we embarked on comprehensive integration planning. Our process included:

  • Thorough mapping of the integration process.
  • Consideration of compatibility across Android and iOS platforms.
  • Identification of potential integration challenges.
  • Creation of a comprehensive roadmap for implementation.
  • Setting clear timelines for each integration phase.
  • Ensuring a seamless and consistent user experience, in line with the value proposition of user-friendliness.


With a well-thought-out integration plan in place, our dedicated development team proceeded to implement the Stripe SDK into the Bulb mobile app. This step included:

  • Utilization of Stripe’s SDK for the integration.
  • Building infrastructure for secure card transactions.
  • Incorporating multiple payment options, such as credit/debit cards, mobile wallets, and direct bank transfers.
  • Striving to offer a wide range of payment choices, in harmony with the value proposition of choice and flexibility.

Testing & Launch

Prior to the official launch, we conducted extensive testing to ensure the payment gateway operated flawlessly. Our testing phase involved a series of rigorous tests to validate the functionality, security, and user-friendliness of the payment processing system. After which the updated Bulb Energy app with the integrated payment processing system. This step include our multi-faceted approach:

  • Functional testing to ensure proper system operation.
  • Security testing involving vulnerability scans and penetration testing.
  • Performance testing to guarantee efficient handling of high transaction volumes.
  • Validation of the system to deliver on the value proposition of reliability and safety.
  • Strategic launch of the Smart Pay as You Go system within the mobile app.
  • Post-launch monitoring by a dedicated team.
  • Swift identification and resolution of potential issues, maintaining a seamless user experience.

key PCI considerations during Bulbs Project

Compliance and Auditing

Establishment of processes and technologies to meet PCI compliance requirements, showcasing the value proposition of trust and accountability.

Data Encryption

Implementation of encryption mechanisms for secure data transmission and storage, reinforcing the value proposition of data security and privacy.

Regular Security Testing

Vulnerability scans and penetration testing to identify and rectify security vulnerabilities, further enhancing the value proposition of ongoing security.

Compliance Validation

Periodic validation of compliance and maintenance of necessary documentation, demonstrating the value proposition of regulatory adherence and transparency.

Sensitive Data Handling

Stringent measures for secure storage, transmission, access control, and data deletion, reinforcing the value proposition of safeguarding customer data and privacy.

Payment API Integration

Seamless integration of the mobile app with the payment provider's API, underscoring the value proposition of a smooth and hassle-free payment experience.

Our tech Stack


  • Secure Payment Gateway

    Iinstilled confidence in users, knowing that their financial information was handled with the utmost care and security.

  • Multiple Payment Options

    The diversification of payment methods not only improved user convenience but also increased the overall satisfaction of our customers.

  • PCI Compliance

    Demonstrated our commitment to maintaining the highest standards of data security and trustworthiness.

  • Improved User Experience

    Bulb's customers could easily manage and make payments directly from the app, leading to improved user experience and higher customer retention.

  • Increased Trust

    The use of a PCI-compliant payment system strengthened customers' trust in the security of the app.

  • Operational Efficiency

    Automated payment processing reduced manual transaction handling efforts, improving operational efficiency.

Our Project in a glance

Bulb recognized a significant growth opportunity by offering a Smart Pay as You Go system to its customers. With 4.3 million households in the UK using prepay energy meters, Bulb quickly designed and launched a beta version of this product within a few months. This strategic move contributed to Bulb becoming the fastest-growing European company in 2021, solidifying its position as a leading energy provider in the UK. This case study showcases how a customer-centric approach, meticulous planning, and the integration of a secure payment processing system can lead to improved user experiences, increased trust, and operational efficiency for a forward-thinking energy provider like Bulb.

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