April 2026 Changelog

April’s Basis Theory updates focused on improving platform reliability, data accuracy, and operational efficiency through a rebuilt BIN details pipeline, enhanced Account Updater results, broader proxy compatibility, and several bug fixes. BIN data now comes from a merged master dataset covering more than 50 weeks of card network history, with automated integrity checks and PCI-compliant DynamoDB delivery designed to prevent valid ranges from disappearing because of incomplete or incorrect weekly source files. Account Updater batch CSVs now include updated card metadata such as last four digits, fingerprint, brand, and expiration details for relevant PAN and brand-conversion updates, reducing the need for individual follow-up API calls. The proxy now accepts Latin-1 non-ASCII response headers from upstream APIs, preventing related 502 failures, while fixes addressed Firefox and LastPass conflicts affecting Web Elements, incorrect session permission handling for ID-based rules, and problematic blank access-rule container values in the portal.

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