Problem:
How to combine Toolset and WooCommerce so that users can be charged to attend events?
Solution:
I think the best approach would be, instead of registering a new Events post type, to treat WC products themselves as Events. (You can change the permalinks to use /event/ instead of /product/, and you could also change the labels for the admin pages so that you would have "Add new Event" etc.; see here for an example: https://stackoverflow.com/questions/26712459/is-it-possible-to-change-the-products-to-be-termed-tours.)
You can add custom fields to events if you need to. Users on the front end can browse events and add them to their cart to buy them, and you can set up variations for with and without lunch, cheap lunch, fancy lunch etc.
Aside from using Toolset to customise the templates for single products (events) and the product archive (event archive) I think you can mostly handle this directly from within WooCommerce.
Problem:
When using the cred_commerce_after_order_completed hook, how is it possible to get the id of the user created by the process?
Solution:
The ID of the created user is stored in a hidden post meta field _cred_post_id stored with the WC order (which can be retrieved with get_post_meta).
Likewise if using Toolset Forms Commerce to charge users to publish posts, the ID of the published post is stored in the same field.
Problem:
When using Toolset Forms Commerce to take payment for registering a user, the cred_save_data hook is no longer helpful for triggering code after the user is created, because the WooCommerce Order needs to be processed and completed first.
Solution:
The Toolset Forms Commerce plugin comes with its own API hooks, such as cred_commerce_after_order_completed which would serve in this case.
We document known issues and their solutions in Toolset errata. Save time by checking there first and seeing if what you are facing is a known issue. This list is kept short. We do our best to resolve all known issues with every release of Toolset plugins.
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