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Expenses by nature (Footnotes) (Details 1) - BRL (R$)
R$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expenses by nature [abstract]          
Freight and maintenance costs     R$ 242,834 R$ 212,813 R$ 120,870
Card issuer costs     3,043,591 1,680,441 1,390,600
Card scheme fees     653,224 432,361 292,629
Obsolescence adjustment and write-down to net realizable value     117,547    
Key management personnel compensation, other long-term employee benefits     370,629 207,012 156,273
Early payment of receivables     426,992 49,204 20,570
Charge backs   R$ 73,356 664,268 288,309 R$ 200,633
Reversal of value-added tax on sales and services R$ 29,114   29,114    
Impairment of tax recoverable     R$ 24,476    
Services tax reversed       R$ 84,294