GTM API (v1) - export & merge import

// export a configuration from a source GTM container and merge import it with a target GTM container
// from: https://developers.google.com/tag-manager/api/v1/

// Get the published version of the source container
// GET https://www.googleapis.com/tagmanager/v1/accounts/{{accountId}}/containers/{{containerId}}/versions/published
source = tagmanager.accounts().containers().versions().get(
    accountId='123456',
    containerId='54321',
    containerVersionId='2'
).execute()

// Create a version in the target container
// POST https://www.googleapis.com/tagmanager/v1/accounts/{{accountId}}/containers/{{containerId}}/versions
target = tagmanager.accounts().containers().versions().create(
    accountId='123456',
    containerId='54321',
    body={
        'name': 'Container Version',
        'notes': 'Sample Container Version',
        'quickPreview': True
    }
).execute()

// Construct a request body (in the form of a Container Version Resource) based on the difference between the source container and the target container
body = target + diff(source, target)
body.name = 'Updated Container Version'
body.notes = 'This Container Version was updated'

// Update this version in the target container
// PUT https://www.googleapis.com/tagmanager/v1/accounts/{{accountId}}/containers/{{containerId}}/versions/{{containerVersionId}}
tagmanager.accounts().containers().versions().update(
    accountId='123456',
    containerId='54321',
    containerVersionId='2',
    body=body
).execute()