v3.26.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2026
Oct. 29, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Document Quarterly Report true  
Document Transition Report false  
Entity Registrant Name Paymentus Holdings, Inc.  
Entity Central Index Key 0001841156  
Entity File Number 001-40429  
Entity Tax Identification Number 45-3188251  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 15601 Dallas Parkway  
Entity Address Address Line2 Suite 600  
Entity Address, City or Town Addison  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75001  
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  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock Shares Outstanding   78,633,959
Common Class B [Member]    
Document Information [Line Items]    
Entity Common Stock Shares Outstanding   47,477,189