Create commerce_payment_method records

WIP migration file.

This comments out the fields that need to be resolved, so only a few fields are actually migrated. When I run this migration on a site as part of a Commerce 1 migration the payments page for an order now includes the payment amount in the "total paid" value and the "order balance" is now 0.00, as it should be.

The last submitted patch, 3: commerce_migrate-n3339270-3.patch, failed testing. View results →

Whoops, forgot to comment out another line. Will this one work?

The last submitted patch, 5: commerce_migrate-n3339270-5.patch, failed testing. View results →

1.x Payment transactions aren't exactly a 1:1 mapping to payment methods in Commerce 2.

The closest equivalent to transactions in 2.x are payment entities, not payment methods, so not sure how this could work?

If you look at the map it creates extra records from the commerce1_payment_transaction source.

Per a Slack conversation, it is possible that the records are only needed for certain payment methods, so logic will be needed to work out which payment records should be given a commerce_payment_method record.

Fixed some values.

Apparently I never learned how to spell the word "default".

One more time for the folks at the back.

I think the "type" value should be based on the available payment method types, so let's try a static_map for that. Some of these were based on the plugin definitions, some were guesses.

Are you sure this migration is what's fixing the payment calculation? I applied the patches from #3295839 and #3339236, imported the payments. Initially the balance was not $0 -- but it corrected itself after flushing caches.