Credit Card Transactions Import in AX 2012 R2

Hi Everyone

I have to import Credit card transactions in AX 2012 R2. As this implementation is from scratch, with no prior experience, I would like to have any documentation or inputs related to this.

My primary doubts being:

1. What is the acceptable format for AX, in which transactions can be imported?

For example: If I want to try and test the import, what data and in which format should I prepare a template?

2. How do we convert the transactions provided by AMEX, VISA etc to the format that can be directly imported into AX?

Thanks in advance.