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ManageOne provides open northbound APIs. It defines a set of easy-to-use APIs providing comprehensive functions. Through the open northbound APIs, ManageOne can interconnect with non-Huawei systems quickly and independently.
Process of calling ManageOne northbound APIs.

IAM: service used by an external system to access ManageOne IAM APIs
ManageOne Operation Portal: service used by an external system to call ManageOne Operation Portal APIs
ManageOne Maintenance Portal: service used by an external system to call ManageOne Maintenance Portal APIs
I have a couple of APIS and documentation on Manageone 8.0.3 that I hope will help you.
Task Type | Document | Description |
Development guide | ManageOne 8.0.3 Northbound API Development Guide | Describes how to use ManageOne APIs to develop applications in typical service scenarios. |
ManageOne Operation Portal API | ManageOne 8.0.3 Operation Portal Northbound API Reference | Provides APIs on ManageOne Operation Portal and supports functions such as VDC, product, subscription, process approval, ,metering, and charging. |
ManageOne 8.0.3 OTenantSecurity Service API Reference | Provides authentication management APIs on ManageOne Operation Portal to obtain tokens and verify token validity, applies to the HUAWEI CLOUD Stack scenario. |
ManageOne 8.0.3 MOAPIAdapter Service API Reference | Provides common APIs for interconnecting with the ManageOne operation plane 3.x and 6.x. This document applies only to the HUAWEI CLOUD Stack scenario. |
ManageOne 8.0.3 Cloud Service Parameter Description | Describes how to use the params parameter of subscription APIs and is used with ManageOne 8.0.3 Operation Portal Northbound API Reference. |
Identity and Access Management 6.1.19 API Reference | Provides APIs related to token authentication on ManageOne Operation Portal, applies to the HCS Online scenario. |
ManageOne Maintenance Portal API | ManageOne 8.0.3 Maintenance Portal Northbound API Reference | Provides northbound interface documents for O&M services and is used when the upper-layer network management system (NMS) integrates O&M data, such as resource, performance, alarm, and log data of ManageOne. NOTE l Provides APIs described in section "Data Analysis Platform" and must be used with ManageOne 8.0.3 Dataset Description Document to implement API capabilities. l Provides APIs described in section "Performance Monitoring" and must be used with ManageOne 8.0.3 Performance Indicator Model to implement API capabilities. l Provides APIs described in section "Resource Management" and must be used with ManageOne 8.0.3 System Resource Northbound Model to implement API capabilities. l Provides APIs described in section "Tenant Assurance" and must be used with ManageOne 8.0.3Tenant Resources Northbound Model to implement API capabilities. |
ManageOne 8.0.3 Dataset Description Document | Describes datasets supported by the ManageOne data analysis platform for external systems and details about the dimensions and attributes supported by each dataset. |
ManageOne 8.0.3 Performance Indicator Model | Describes the resource types and indicators of performance indicators supported by ManageOne. |
ManageOne 8.0.3 System Resource Northbound Model | Describes system resource models and attributes supported by ManageOne. |
ManageOne 8.0.3 Tenant Resources Northbound Model | Describes tenant resource models and attributes supported by ManageOne. |
ManageOne 8.0.3 Northbound Alarm SNMP Interface Developer Guide | Describes the ManageOne alarm SNMP northbound API and is used when the upper-layer NMS integrates ManageOne alarm data. |
ManageOne-NBI-Alarm-MIB-V1.mib | Indicates the MIB file of ManageOne Alarm SNMP V1 and is used with ManageOne 8.0.3 Northbound Alarm SNMP Interface Developer Guide. |
ManageOne-NBI-Alarm-MIB-V2.mib | Indicates the MIB file of ManageOne Alarm SNMP V2 and is used with ManageOne 8.0.3 Northbound Alarm SNMP Interface Developer Guide. |
https://support.huawei.com/enterprise/en/doc/EDOC1100187610?section=i002
Hope this can help you!