| Document and Entity Information | Aug. 07, 2023 |
| Document Information [Line Items] | |
| Amendment Flag | false |
| Document Type | 8-K |
| Document Period End Date | Aug. 07, 2023 |
| Entity File Number | 001-40429 |
| Entity Registrant Name | Paymentus Holdings, Inc. |
| Entity Central Index Key | 0001841156 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 45-3188251 |
| Entity Address, Address Line One | 11605 North Community House Road |
| Entity Address, Address Line2 | Suite 300 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28277 |
| City Area Code | (888) |
| Local Phone Number | 440-4826 |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | PAY |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
