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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