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<PAGE> 1 EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-82369) of S1 Corporation of our report dated June 21, 2000 relating to the financial statements of the Security First Technologies, Inc. 401(k) Savings Plan, which appears in this Form 11-K. PricewaterhouseCoopers LLP Atlanta, GA June 28, 2000
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