Miscellaneous about processing

Fix invalid geometry (and register the output to use it later)

Here we register the output with the name MyFixedLayer. So we can use it later.

alg_params = {
    'INPUT':'E:\\Downloads\\MyLayer.shp',
    'METHOD':1,
    'OUTPUT':'E:\\Downloads\\MyFixedLayer.shp'
}
outputs['MyFixedLayer'] = processing.run('native:fixgeometries', alg_params, context=context)

Fix invalid geometry (from a previous output registered)

alg_params = {
'INPUT': outputs['MyPreviousOutput']['OUTPUT'],
'METHOD':1,
'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
}
outputs['MyNewOutput'] = processing.run('native:fixgeometries', alg_params, context=context)