GRAPHQL BEST PRACTICES FOR SECURE AND EFFICIENT FINANCIAL DATA APIS

Omisope Abiodun Oluwasegun; Asiyanbola Olaoluwa Ebenezer; Samson Precious Loveth; Iyiola Ifeoluwa Johnson; Awogbade Kehinde

doi:10.5281/zenodo.21501558

Abstract

Application Programming Interfaces (APIs) are becoming a more and more significant way for financial institutions to provide digital banking, investment management, insurance, payment processing, and wealth management services. APIs need to be capable of handling a large volume of transactions, low latency, security, and regulatory adherence, while also providing smooth integration between the distributed services within financial ecosystems. While REST has been the standard approach for financial API development, GraphQL is a new and more flexible way of retrieval, with a reduced network footprint and greater developer productivity. But such flexibility also poses security and performance risks to GraphQL such as the complexity of queries, unintended disclosure of data, denial of service attacks, and suboptimally designed resolvers. In this article, we will explore some of the best practices for creating secure and efficient GraphQL APIs for financial applications. It covers the architecture of GraphQL, authentication and authorization options, query optimization techniques, API governance and deployment on cloud-native infrastructure, monitoring, and regulatory compliance. A conceptual GraphQL security framework is presented to illustrate how financial institutions can leverage strong access control, performance optimization, DevSecOps methodologies, and continual monitoring to create robust financial data APIs. Overall, the study suggests that while GraphQL holds great promise, it can be highly effective in improving the performance and flexibility of financial APIs if it is configured and operated with robust security measures, predictive caching, query validation, and scalable, cloud-native architectures.

Keywords

GraphQL, Financial APIs, API Security, DevSecOps, Digital Banking, API Governance, Cloud Computing, Financial Technology, Cybersecurity

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