Transaction details

1. I want to show transactions list or payment history to user, in that case how can I proceed ?

I’m not clear what you mean by user do you mean website visitors or a logged in user?

2. Where the details about transaction’s are saved in database ?

In version 5 ( the current ) they are stored in the options table under an option per form starting with qpp_messages for default and the qpp_messagesformname for other forms – wrote a quick gist to demonstrate

https://gist.github.com/alanef/494fc66f09361fcc70668a1b76ce7f40

In Version 6 – not released and under development but no planned date at the moment – they will change to Custom Posts – just be aware as custom work now maybe impacted at a future date.

1. For logged in user who did payments, need to show transactions list.
How to show ?

2. I am still not getting which table you are using to store the transaction details?
In phpMyAdmin , I looked into wp_options tables but no data available.
Could you please provide exact way to find ?

1. For logged in user who did payments, need to show transactions list.
How to show ?

This is not a feature of the free or premium plugin, it does not record logged in users IDs on the payment record.

You would need to make custom alterations to the save part of the payment transaction.

2. I am still not getting which table you are using to store the transaction details?
In phpMyAdmin , I looked into wp_options tables but no data available.
Could you please provide exact way to find ?

I provided you the exact details above including working and tested code examples.

https://gist.github.com/alanef/494fc66f09361fcc70668a1b76ce7f40

If you can’t find it in your database then you are looking at the wrong thing.