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SEGMENTS - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 segment | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 3 |
Minimum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
FI partner terms (in years) | 3 years |  | 3 years |
Maximum |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
FI partner terms (in years) | 7 years |  | 7 years |
Marketers | Revenue Benchmark | Top Five Marketers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 12.00% | 17.00%
Marketers | Accounts Receivable | Top Five Marketers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 20.00% | 16.00%
Supplier Concentration Risk | Financial Institution Partner | Three Largest FI Partners |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 95.00% | 85.00%
Supplier Concentration Risk | Financial Institution Partner | Largest FI Partner One |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 50.00% |
Supplier Concentration Risk | Financial Institution Partner | Largest FI Partner Two |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 30.00% |
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 0.8 |  |  |
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures | $ 0.1 | $ 0.1 |  |

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