How to achieve concurrent Transactions works with DB

Getting Help
1

I want to create a secure payment service where user may deposit funds, withdraw funds, and there may be transacions between two accounts.
I want to achieve transactions works concurrently.I am using postgreSQL as a DB.
Please help me out how can I create this ?

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2

As far as I know, access to the database shouldn’t be concurrent, because your one gorutine may change the state of database while another gorutine is trying to read some data from the database

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