Currency list we are passing in config as string can be atoms

[pkrawat1]

Currently, we are passing currency as a string "USD" in the application config :global_config.

This can be improved to use atoms like :usd or something which can be driven and controlled by the library instead of a plane string.

[oyeb]

Atoms are best suited for keys (in a map or keyword), as far as I've read.
We'll have to convert these atoms to upcase strings when making requests to the gateway anyways. There's a thread on elixirforum discussing serialisation and atoms.

[SagarKarwande]

As there is limit on atoms count in erlang. link

• Though using atom for currency/country code will not increase atom count at great extent. But huge project may consider huge atom count for using library.
• Also some gateway are using atoms for keys in the post body creation. So should we use string or atom there.

[oyeb]

This is now obsolete because of #62 and #71.
It's the Money lib's responsibility to provide a sane/nice interface to create Money objects.