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Accounts receivable, net | 12 Months Ended
--- | ---
Dec. 31, 2018
Accounts receivable, net |
Accounts receivable, net | 5. Accounts receivable, net Components of accounts receivable are as follows:
|  | As of December 31,
|  | 2017 |  | 2018
|  | RMB |  | RMB
Other trade receivables (Note a) |  | 4,611,930 |  | 5,302,391
Delivery service providers (Note b) |  | 298,124 |  | 458,488
Others |  | 18,364 |  | 31,396
Subtotal |  | 4,928,418 |  | 5,792,275
Less: allowance for doubtful accounts |  | (124,891) |  | (117,544)
Total |  | 4,803,527 |  | 5,674,731
Note: (a) The Group provides consumer financing to certain customers as part of the Group’s Internet financing business. As of December 31, 2017 and 2018, RMB 1.0 billion and RMB1.2 billion receivables from customer financing were collateralized for the issuance of asset-backed debts, respectively. Details of the securitization debt are set out in Note 18. (b) For certain sales transactions, third party delivery service providers will collect payments from the Group’s customers upon delivery of goods, and remit such payments back to the Group on a periodic basis. The movement of allowance for doubtful debts during the years are as follows:
|  | Year ended December 31,
|  | 2016 |  | 2017 |  | 2018
|  | RMB |  | RMB |  | RMB
Allowance for doubtful accounts: |  |  |  |  |  |
Balance at beginning of the year |  | — |  | (46,209) |  | (124,891)
Provision for allowance during the year |  | (53,316) |  | (111,183) |  | (166,396)
Write-offs during the year |  | 7,107 |  | 32,501 |  | 173,743
Balance at end of the year |  | (46,209) |  | (124,891) |  | (117,544)

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- References No definition available. + Details
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- Definition Disclosure of the carrying amount of the components of trade receivables, net, due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed. Also includes the disclosure for concentration risks associated with trade accounts receivable existing at the date of the financial statements. + References No definition available. + Details
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