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Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 239,812	$ 219,867	$ 464,442	$ 425,586
Other income, net	1,006	668	2,113	1,300
SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	162,788	154,769	314,029	298,516
B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	24,668	21,614	48,356	42,729
Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	52,356	43,484	102,057	84,341
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	240,921	220,652	466,617	426,990
Operating Segments \| SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	163,230	155,101	314,920	299,105
Operating Segments \| B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	25,033	21,881	48,951	43,225
Operating Segments \| Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	52,658	43,670	102,746	84,660
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(1,109)	(785)	(2,175)	(1,404)
Eliminations \| SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	(442)	(332)	(891)	(589)
Eliminations \| B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	(365)	(267)	(595)	(496)
Eliminations \| Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	(302)	(186)	(689)	(319)
Merchant card fees
Disaggregation of Revenue [Line Items]
Revenues	180,483	169,246	347,562	327,193
Merchant card fees \| Operating Segments \| SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	158,825	150,696	306,307	290,496
Merchant card fees \| Operating Segments \| B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	21,488	18,682	41,257	36,971
Merchant card fees \| Operating Segments \| Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	968	451	1,575	804
Merchant card fees \| Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(798)	(583)	(1,577)	(1,078)
Money transmission services
Disaggregation of Revenue [Line Items]
Revenues	39,273	31,340	76,722	60,484
Money transmission services \| Operating Segments \| SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Money transmission services \| Operating Segments \| B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Money transmission services \| Operating Segments \| Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	39,273	31,340	76,722	60,484
Money transmission services \| Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Outsourced services and other services
Disaggregation of Revenue [Line Items]
Revenues	16,853	16,256	33,855	31,921
Interest income	14,100	13,100	26,700	25,000
Other income, net	1,000	600	2,100	1,200
Outsourced services and other services \| Operating Segments \| SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	1,202	1,380	2,310	2,621
Outsourced services and other services \| Operating Segments \| B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	3,545	3,199	7,694	6,254
Outsourced services and other services \| Operating Segments \| Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	12,417	11,879	24,449	23,372
Outsourced services and other services \| Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(311)	(202)	(598)	(326)
Equipment
Disaggregation of Revenue [Line Items]
Revenues	3,203	3,025	6,303	5,988
Equipment \| Operating Segments \| SMB Payments
Disaggregation of Revenue [Line Items]
Revenues	3,203	3,025	6,303	5,988
Equipment \| Operating Segments \| B2B Payments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Equipment \| Operating Segments \| Enterprise Payments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Equipment \| Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0