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Service Registration & Discovery
User login flow with Auth service provider
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(Note: API token may be used for the external systems such as OSS/BSS, however, the generation of API token is not considered to be relevant to MSB(External API Gateway))
External service request flow
(Assumption: the external system(OSS/BSS) or user agent(Browser) already get authenticated and allocated a token, it can be either a user token for ONAP user or an API token for OSS/BSS)
Internal service request flow
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