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How to hook into Commerce after payment complete

I need to be able to run code that does not output any data to the user after a user's checkout is complete, but I can't seem to figure out how Commerce wants me to do it. I don't see any *.api.php files that would give me payment hooks. It looks like Commerce wants me to create a separate Checkout Flow plugin that would add the step I want, but I can't seem to find documentation about implementing my own Checkout Flow.

Can you guide me to the right path of running my code when the checkout is complete? Am I on the right path? Can you point to Checkout Flow development docs?

I can't remove #theme_wrappers functions from $variables in hook_preprocess_HOOK

Hi! I want to remove fieldset wrapper around radios element in my custom form. For this I use hook_preprocess_HOOK:

function mymodule_preprocess_radios(&$variables) {
  $variables['element']['#theme_wrappers'] = [];
}

But fieldset wrapper all the same remains in output html on page.
How to remove fieldset tag ?

hook_form_alter on

Dear everyone,

Migration Module - Rules not working properly

Hi There,

I'm using the migration module to import information from a legacy database and having a little bit of trouble.

The migration class in question imports pets from a table (old db) and creates new pet nodes in the drupal database. So far, so good. The pet migration class is also connected to the user migration class. This means that I can set the author (uid) of each pet to the appropriate new drupal user. Again so far so good. This also means the setup is more or less the same as the old database.

Menu block gets alot bigger when logged out

Hello,

I am working on a website for a customer and i stumbled upon a problem. I made a menu that can be changed into 3 languages. this morning it was looking/working completely fine. But when i tried to put in the country flags the whole layout got ruined (only when logged out)

This is how the menu block looks when logged in:
https://gyazo.com/2124d56e3fc81bb1e6b313db0f590cbe

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