Add information about id

Author: Full-Hat

docs/develop/dapps/asset-processing/README.md

@@ -178,6 +178,12 @@ main();
 7. Service should regularly poll the [getTransactions](https://toncenter.com/api/v2/#/transactions/get_transactions_getTransactions_get) method for the `wallet` contract. Matching confirmed transactions with the outgoing payments by (`destination_address`, `value`, `comment`) allows to mark payments as finished; detect and show the user the corresponding transaction hash and lt (logical time).
 8. Requests to `v3` of `high-load` wallets have an expiration time equal to 60 seconds by default. After that time unprocessed requests can be safely resent to the network (see steps 3-6).
 
+### Get transaction id
+
+It can be unclear that to get more information on transaction user must scan blockchain through [getTransactions](https://toncenter.com/api/v2/#/transactions/get_transactions_getTransactions_get) function.
+It is impossible to retrieve the transaction ID immediately after sending a message, as the transaction must first be confirmed by the blockchain network.
+To understand required pipeline read [Send payments](https://docs.ton.org/develop/dapps/asset-processing/#send-payments) carefully, especially 7th point.
+
 ## Invoice-based approach
 To accept payments based on attached comments, the service should
 1. Deploy the `wallet` contract.
@@ -469,6 +475,7 @@ if __name__ == "__main__":
 
 </TabItem>
 </Tabs>
+</Tabs>
 
 ### Toncoin Withdrawals (Send toncoins)