[Case Study] CPA Excellent Partners Integrates ID Platform for Approximately 800,000 Students in About 5 Months ~ Realizing a Secure and Scalable Digital Ecosystem with "Tactna" and "Auth0" ~
TC3 Corporation announced a case study where CPA Excellent Partners integrated its ID platform for approximately 800,000 students in about 5 months using "Tactna" and "Auth0." This achieved significant reductions in development costs, standardization of ID integration flows, and improved user convenience, establishing security and service governance for the AI agent era.
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- 📰 Published: May 12, 2026 at 17:00
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TC3 Corporation (hereinafter, TC3, Headquarters: Chiyoda-ku, Tokyo, Representative Director: Yoshito Sudo), which provides "Tactna," a unified ID and service platform that realizes security and service governance for the AI agent era, announced that it has introduced "Tactna" and Okta's customer identity management platform "Auth0" as a common ID platform for CPA Excellent Partners Co., Ltd. (Headquarters: Shinjuku-ku, Tokyo, Representative Director: Kensuke Kunimi, hereinafter "CPA"), which develops accounting professional training and career support, and has achieved the integration of IDs for approximately 800,000 students in about 5 months.
■ Project Background: Integration of a Platform for Approximately 800,000 Users and Fundamental Strengthening of Security
CPA operates large-scale learning and career support platforms such as "CPA Accounting Academy," "CPA Learning," and "CPA Jobs," serving over 800,000 students.
While each service was individually optimized, CPA aimed to transition to a phase where integrating these services around an ID platform would further enhance user experience, maximize data utilization, and strengthen the security foundation.
■ Results and Features of the Introduction
In this project, a phased migration was carried out in two phases. Despite a tight schedule to complete the integration of "Accounting Academy" in October and "CPA Learning / CPA Jobs" in November, the following results were achieved by utilizing Tactna and Auth0:
1. Dramatic Reduction in Development Man-hours and Costs:
Compared to full-scratch development, initial costs were reduced by two-thirds, and time-to-market was improved by 50% (development period halved).
2. Standardization of Complex "ID Integration Flow":
An "ID Integration Module" was built to securely and smoothly integrate accounts for users with IDs across multiple existing services upon their first login. The technical difficulty of name matching was resolved by combining Tactna's standard and custom functions.
3. Ensuring User Convenience:
Utilizing Tactna's past implementation references, login is supported not only with email addresses but also with traditional "student numbers."
■ Future Outlook
CPA aims to make this platform the core infrastructure for "accounting and finance professionals" and provide even more valuable services to them. Tactna also intends to provide functions that can meet such use cases.
■ Customer Comment
"As a platform with approximately 800,000 registered users, further enhancing user experience and strengthening the security foundation were among our top priorities.
Initially, we considered full-scratch development, but by choosing the combination of Tactna and Auth0, we were able to reduce costs by one-third and release in a short period of 'half a year,' which would be unthinkable with scratch development. In particular, the existence of Tactna's 'migration module' for securely integrating existing users was extremely important in eliminating technical uncertainties.
Now that a robust foundation of common IDs is in place, we can concentrate more resources on providing next-generation services through the provision of AI agents and enriching user experience by utilizing data. TC3 is a reliable partner that maximizes our business speed from a technical perspective."
――Toshikazu Ogawa, CTO, CPA Excellent Partners Co., Ltd.
■ Comment from Okta
"We are very pleased that Auth0 has contributed to the realization of CPA Excellent Partners' vision. The completion of a complex migration involving 800,000 users in a short period, thanks to TC3's 'Tactna' and its advanced implementation capabilities, will serve as an excellent model case for Japanese companies aiming to modernize identity management with an eye toward AI utilization in the future."
――Takashi Watanabe, Representative Director and President, Okta Japan Co., Ltd.
■ Conclusion
This time, it was a big step to allow approximately 800,000 users to log in and use web services they use daily and services they want to promote cross-use in the future with a single ID. By using Tactna and Auth0, the speed of introduction was increased. TC3 will strive to contribute to the business domain related to IDs while being involved in the operation of this platform in the future.
Click here for detailed case study article
For more details on this case study, please check the page summarizing TC3's case studies. If you are considering ID integration, please check it out.
■ Project Background: Integration of a Platform for Approximately 800,000 Users and Fundamental Strengthening of Security
CPA operates large-scale learning and career support platforms such as "CPA Accounting Academy," "CPA Learning," and "CPA Jobs," serving over 800,000 students.
While each service was individually optimized, CPA aimed to transition to a phase where integrating these services around an ID platform would further enhance user experience, maximize data utilization, and strengthen the security foundation.
■ Results and Features of the Introduction
In this project, a phased migration was carried out in two phases. Despite a tight schedule to complete the integration of "Accounting Academy" in October and "CPA Learning / CPA Jobs" in November, the following results were achieved by utilizing Tactna and Auth0:
1. Dramatic Reduction in Development Man-hours and Costs:
Compared to full-scratch development, initial costs were reduced by two-thirds, and time-to-market was improved by 50% (development period halved).
2. Standardization of Complex "ID Integration Flow":
An "ID Integration Module" was built to securely and smoothly integrate accounts for users with IDs across multiple existing services upon their first login. The technical difficulty of name matching was resolved by combining Tactna's standard and custom functions.
3. Ensuring User Convenience:
Utilizing Tactna's past implementation references, login is supported not only with email addresses but also with traditional "student numbers."
■ Future Outlook
CPA aims to make this platform the core infrastructure for "accounting and finance professionals" and provide even more valuable services to them. Tactna also intends to provide functions that can meet such use cases.
■ Customer Comment
"As a platform with approximately 800,000 registered users, further enhancing user experience and strengthening the security foundation were among our top priorities.
Initially, we considered full-scratch development, but by choosing the combination of Tactna and Auth0, we were able to reduce costs by one-third and release in a short period of 'half a year,' which would be unthinkable with scratch development. In particular, the existence of Tactna's 'migration module' for securely integrating existing users was extremely important in eliminating technical uncertainties.
Now that a robust foundation of common IDs is in place, we can concentrate more resources on providing next-generation services through the provision of AI agents and enriching user experience by utilizing data. TC3 is a reliable partner that maximizes our business speed from a technical perspective."
――Toshikazu Ogawa, CTO, CPA Excellent Partners Co., Ltd.
■ Comment from Okta
"We are very pleased that Auth0 has contributed to the realization of CPA Excellent Partners' vision. The completion of a complex migration involving 800,000 users in a short period, thanks to TC3's 'Tactna' and its advanced implementation capabilities, will serve as an excellent model case for Japanese companies aiming to modernize identity management with an eye toward AI utilization in the future."
――Takashi Watanabe, Representative Director and President, Okta Japan Co., Ltd.
■ Conclusion
This time, it was a big step to allow approximately 800,000 users to log in and use web services they use daily and services they want to promote cross-use in the future with a single ID. By using Tactna and Auth0, the speed of introduction was increased. TC3 will strive to contribute to the business domain related to IDs while being involved in the operation of this platform in the future.
Click here for detailed case study article
For more details on this case study, please check the page summarizing TC3's case studies. If you are considering ID integration, please check it out.