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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Concentration Risk [Line Items] |  |
Total revenue | $ 86,029 | $ 73,939
Revenue earned over time |  |
Concentration Risk [Line Items] |  |
Total revenue | 78,028 | 54,014
Revenue earned at a point in time |  |
Concentration Risk [Line Items] |  |
Total revenue | 8,001 | 19,925
Merchant Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 32,834 | 29,177
Merchant Services | Revenue earned over time |  |
Concentration Risk [Line Items] |  |
Total revenue | 27,597 | 22,734
Merchant Services | Revenue earned at a point in time |  |
Concentration Risk [Line Items] |  |
Total revenue | 5,237 | 6,443
Software and Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 53,213 | 44,774
Software and Services | Revenue earned over time |  |
Concentration Risk [Line Items] |  |
Total revenue | 50,441 | 31,288
Software and Services | Revenue earned at a point in time |  |
Concentration Risk [Line Items] |  |
Total revenue | 2,772 | 13,486
Other |  |
Concentration Risk [Line Items] |  |
Total revenue | (18) | (12)
Other | Revenue earned over time |  |
Concentration Risk [Line Items] |  |
Total revenue | (10) | (8)
Other | Revenue earned at a point in time |  |
Concentration Risk [Line Items] |  |
Total revenue | (8) | (4)
Software and related services revenue |  |
Concentration Risk [Line Items] |  |
Total revenue | 41,114 | 36,338
Software and related services revenue | Merchant Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 2,979 | 2,962
Software and related services revenue | Software and Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 38,145 | 33,384
Software and related services revenue | Other |  |
Concentration Risk [Line Items] |  |
Total revenue | (10) | (8)
Payments revenue |  |
Concentration Risk [Line Items] |  |
Total revenue | 40,354 | 33,466
Payments revenue | Merchant Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 27,609 | 24,304
Payments revenue | Software and Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 12,753 | 9,166
Payments revenue | Other |  |
Concentration Risk [Line Items] |  |
Total revenue | (8) | (4)
Other revenue |  |
Concentration Risk [Line Items] |  |
Total revenue | 4,561 | 4,135
Other revenue | Merchant Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 2,246 | 1,911
Other revenue | Software and Services |  |
Concentration Risk [Line Items] |  |
Total revenue | 2,315 | 2,224
Other revenue | Other |  |
Concentration Risk [Line Items] |  |
Total revenue | $ 0 | $ 0

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