How to Use Payment Extension Attributes in Magento 2

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Magento 2 is the leading E-commerce platform that provides improved scalability and flexibility for an online store.
An example of Magento 2’s flexibility is that store owners can customize and overwrite the core features of its framework according to the business requirements.
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Method to Use Payment Extension Attributes in Magento 2

  1. Create registration.php file at appcodeVendorModule
  2. Create module.xml file at appcodeVendorModuleetc
  3. Create an extension_attributes.xml file at appcodeVendorModuleetc
  4. Create a requirejs-config.js file at appcodeVendorModuleviewfrontend
  5. Create place-order-mixin.js file at appcodeVendorModuleviewfrontendwebjsorder
  6. Create custom-assigner.js at appcodeVendorModuleviewfrontendjsorder
  7. Create set-payment-information-mixin.js at appcodeVendorModuleviewfrontendjsorder
  8. Create di.xml at appcodeVendorModuleetc
  9. Create SavePaymentPlugin.php at VendorModulePluginModel
  10. Create GuestSavePaymentPlugin.php at VendorModulePluginModel

For example, the customers enter custom messages or comments while placing the order, and to save these comments, you need to pass it with the payment details using knockout JS.
The below solution is the method to use payment extension attributes in Magento 2 that allows saving the custom field values in the database.
The below method shows the same:
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Magento 2 extension attributes are primarily containers used for adding an additional piece of information to our entities that allow adding additional custom data into an entity such as Product, Customer, Order, etc.
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One such requirement is to add custom fields into our entities. To serve this purpose, Magento 2 offers a flexible and declarative way to extend functionality that is called extension attributes.

Done!
Now you can easily save your additional field’s data after placing an order.

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