Using swagger-editor, we can see that swagger.json for SDC External API is not compliant with swagger specifications.

Errors

Semantic error at paths./v1/registerForDistribution.post.parameters

Operations must have no more than one body parameter
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Semantic error at paths./v1/registerForDistribution.post.parameters[7]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 336

Semantic error at paths./v1/unRegisterForDistribution.post.parameters

Operations must have no more than one body parameter
Jump to line 432

Semantic error at paths./v1/unRegisterForDistribution.post.parameters[7]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 467

Semantic error at paths./v1/catalog/{assetType}/{uuid}/resourceInstances/{resourceInstanceName}/artifacts/{artifactUUID}.get.operationId

operationIds must be unique
Jump to line 502

Semantic error at paths./v1/catalog/{assetType}/{uuid}/resourceInstances/{resourceInstanceName}/artifacts/{artifactUUID}.post.parameters

Operations must have no more than one body parameter
Jump to line 594

Semantic error at paths./v1/catalog/{assetType}/{uuid}/resourceInstances/{resourceInstanceName}/artifacts/{artifactUUID}.post.parameters[12]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 665

Semantic error at paths./v1/catalog/{assetType}/{uuid}/artifacts/{artifactUUID}.post.parameters

Operations must have no more than one body parameter
Jump to line 889

Semantic error at paths./v1/catalog/{assetType}/{uuid}/artifacts/{artifactUUID}.post.parameters[11]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 953

Semantic error at paths./v1/catalog/{assetType}/{uuid}/artifacts.post.parameters

Operations must have no more than one body parameter
Jump to line 1089

Semantic error at paths./v1/catalog/{assetType}/{uuid}/artifacts.post.parameters[10]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 1146

Semantic error at paths./v1/catalog/{assetType}/{uuid}/resourceInstances/{resourceInstanceName}/artifacts.post.parameters

Operations must have no more than one body parameter
Jump to line 1189

Semantic error at paths./v1/catalog/{assetType}/{uuid}/resourceInstances/{resourceInstanceName}/artifacts.post.parameters[11]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 1253

Semantic error at paths./v1/catalog/{assetType}.post.parameters

Operations must have no more than one body parameter
Jump to line 1382

Semantic error at paths./v1/catalog/{assetType}.post.parameters[8]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 1425

Semantic error at paths./v1/catalog/{assetType}/{uuid}/lifecycleState/{lifecycleOperation}.post.parameters

Operations must have no more than one body parameter
Jump to line 1610

Semantic error at paths./v1/catalog/{assetType}/{uuid}/lifecycleState/{lifecycleOperation}.post.parameters[10]

Operation parameters must have unique 'name' + 'in' properties
Jump to line 1665