(Amounts in thousands of Brazilian reais – R$, unless otherwise stated)



    2009 2008 01.01.2008
               
Prepayment of receivables (a) 1,164,376 146,643 -
Bank account blocking (b) 2,333 6,051 2,275
Provision of electronic network interconnection services between health operators (c) 4,534 3,943 4,883
Companhia Brasileira de Soluções e Serviços – CBSS (d) 3,351 3,353 4,994
Other receivables 4,190 2,953 2,551
Total 1,178,784 162,943 14,703

(a)  On September 1st, 2008 and January 5, 2009, the Company started to provide prepayment services of receivables in cash and in installments, respectively, to affiliated merchants. As of December 31, 2009, the balance corresponds to prepayment of receivables transactions receivable from the card-issuing banks within up to 360 days after the date receivables are prepaid to merchants. As of December 31, 2009, this amount is net of the discount to present value of related charges in the amount of R$35,266, charged to financial income (expenses) (see Note 30).
The ten largest merchants that prepaid receivables accounted for 27.5% of the total revenue of prepayment receivables for the year ended December 31, 2009.
(b)  The Company offers card-issuing banks, bank account blocking services, upon prior approval from merchants to block any transfer of receivables from such merchants to another bank. For these services, the Company receives a commission, which is paid in the month subsequent to the request of the bank account blocking by the card-issuing banks.
(c)  Receivables from the jointly-owned subsidiary Orizon arising from the provision of electronic network interconnection services, based on a single technology platform, for exchange of information between health operators and medical and hospital service providers, and any other health system agents and drugstores.
(d)  Receivables from CBSS (jointly-controlled entity) arising on the provision of transportation and meal tickets card capture and processing services.

The aging of "Trade accounts receivable" is as follows:

    2009 2008 01.01.2008
               
Current 1,175,302 160,997 12,641
Past-due up to 45 days 3,482 1,946 2,062
    1,178,784 162,943 14,703


The balance recorded in "Trade accounts receivable" is net of the allowance for doubtful accounts, which totals R$1,457 as of December 31, 2009 (R$2,164 as of December 31, 2008).