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You can start a migration almost anywhere in the Gateway Manager:
Migrations & APIs
Environment
Resources
API: You can select the APIs to be migrated here.
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The resources you select are automatically set to NewOrUpdate and overwrite the default mappings. In combination with the search and the checkboxes, it is possible to change many mappings at once. You can customise the mappings for each destination.
In "Pipeline" you can perform various actions before and after the migration, such as "Disable via Admintools" or "Call an URL via GET".
You should only edit the "Template Variables" if you know what you are doing.
Migration Result
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Done! You get an overview of the results of the migration with logs and the raw XML data.