GOODWILL AND ACQUIRED INTANGIBLES - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 89,985		$ 92,300
Accumulated Amortization	(57,841)		(52,424)
Net	32,144		34,929
Bridge And Dosh Holdings Acquisitions
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss			(4,947)
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			2,315
Accumulated Amortization			(1,802)
Net			0
Weighted Average Remaining Useful Life		0 years
Goodwill, Impaired, Accumulated Impairment Loss			(513)
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	64,070		64,070
Accumulated Amortization	(36,521)		(33,838)
Net	$ 27,549		29,783
Weighted Average Remaining Useful Life	3 years 1 month 6 days	3 years 4 months 24 days
Goodwill, Impaired, Accumulated Impairment Loss			(449)
Merchant relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 25,915		25,915
Accumulated Amortization	(21,320)		(16,784)
Net	$ 4,595		5,146
Weighted Average Remaining Useful Life	2 years 1 month 6 days	2 years 4 months 24 days
Goodwill, Impaired, Accumulated Impairment Loss			$ (3,985)