Fundraising plugin meta key values for front end form

I am using WP User frontend pro so users can create their own fundraisers. It works really well, I've mapped the form fields to the correct meta keys. The form creates post type funder perfectly.

Now I want to allow the users to add manual pledges, post type donation.

However, I am having trouble working out the right meta keys for this post type.

In the databse all the info is grouped in one meta key "wdf_transaction".

I need the meta keys for:
post_parent
wdf[transaction][name]
wdf[transaction][payer_email]
wdf[transaction][gross]
wdf[transaction][gateway]

thanks for the help