> ## Documentation Index > Fetch the complete documentation index at: https://docs.mnai.com/llms.txt > Use this file to discover all available pages before exploring further. # Activate a pending enrollment > Creates or resumes the enrollment for the authenticated Meridian account and returns the current enrollment state. ## OpenAPI ````yaml /products/meridian-accounts/api-reference/meridian-accounts.json post /v1/enrollment/activate openapi: 3.1.1 info: title: Meridian API version: '1.0' description: API documentation for Meridian services contact: name: Meridian url: https://mnai.com email: support@mnai.com license: name: Proprietary url: https://mnai.com servers: - url: https://sandbox-api.va.meridianpay.com description: Sandbox - url: https://api.va.mnai.com description: Production security: [] paths: /v1/enrollment/activate: post: tags: - Enrollment summary: Activate a pending enrollment description: >- Creates or resumes the enrollment for the authenticated Meridian account and returns the current enrollment state. operationId: createMeridianEnrollment parameters: - name: Authorization in: header description: >- Bearer authentication header of the form `Bearer {token}`. Required for client-server (JWT) authentication. See [Authentication](/products/meridian-accounts/guides/authentication-overview). schema: type: string - name: X-Meridian-Program-Id in: header description: >- Identifies the program context for the request. Required for server-to-server (HMAC) authentication. See [Authentication](/products/meridian-accounts/guides/authentication-overview). schema: type: string - name: X-Meridian-User-Id in: header description: >- Identifies the Meridian user targeted by the request. Required for server-to-server (HMAC) authentication with MULTI_USER integrations; omit for SINGLE_USER. See [Authentication](/products/meridian-accounts/guides/authentication-overview). schema: type: string - name: X-Meridian-Api-Key in: header description: >- Partner API key issued by Meridian during provisioning. Required for server-to-server (HMAC) authentication. See [Authentication](/products/meridian-accounts/guides/authentication-overview). schema: type: string - name: X-Meridian-Timestamp in: header description: >- Current time in milliseconds since the Unix epoch. Must be within 60 seconds of the request. Required for server-to-server (HMAC) authentication. See [Authentication](/products/meridian-accounts/guides/authentication-overview). schema: type: string - name: X-Meridian-Signature in: header description: >- HMAC SHA-256 signature of the canonical request string, computed per request. Required for server-to-server (HMAC) authentication. See [Authentication](/products/meridian-accounts/guides/authentication-overview) for how to construct it. schema: type: string responses: '200': description: >- The activated or existing enrollment state for the authenticated account content: application/json: schema: $ref: '#/components/schemas/Enrollment Response' '401': description: Missing or invalid authentication content: application/json: schema: $ref: '#/components/schemas/MeridianError' '403': description: >- The authenticated caller is not permitted: JWT scope missing, or the partner API key lacks entitlement, user ownership, or user-type match content: application/json: schema: $ref: '#/components/schemas/MeridianError' '500': description: Unexpected error while activating the enrollment content: application/json: schema: $ref: '#/components/schemas/MeridianError' security: - meridian-account-jwt: [] - partner-api-key: [] components: schemas: Enrollment Response: type: object title: Enrollment Response description: Enrollment state for the authenticated Meridian account required: - id - createdAt - updatedAt - status properties: id: type: string description: Unique identifier of the enrollment example: enrollment_123 createdAt: type: string description: Timestamp when the enrollment was created example: '2026-04-01T12:00:00Z' format: date-time updatedAt: type: string description: Timestamp when the enrollment was last updated example: '2026-04-01T12:05:00Z' format: date-time status: type: string description: Current status of the enrollment example: ACTIVE enum: - INACTIVE - ACTIVE statusReason: type: - string - 'null' description: Reason for the current enrollment status, when one applies example: REVOKED enum: - REVOKED latestInformationRequest: oneOf: - $ref: '#/components/schemas/Information Request Summary' - type: 'null' MeridianError: type: object title: com.meridianpay.core.common.api.MeridianError description: >- Represents an error response from the Meridian API, including validation errors and an optional error code. required: - message properties: validationErrors: type: array description: >- An array of validation errors that occurred during the processing of the request. This field is optional and may be empty if there are no validation errors. items: $ref: '#/components/schemas/ValidationError' errorCode: type: - string - 'null' description: >- An optional error code that provides additional information about the error. This field is optional and may be null. message: type: string description: >- A human-readable message describing the error. This field is required and should provide a clear explanation of the error that occurred. Information Request Summary: type: object title: Information Request Summary description: Summary Information Request entry for the authenticated Meridian account required: - id - status - subjectType - subjectId - validationStatus - createdAt - updatedAt properties: id: type: string description: Unique identifier of the Information Request example: ir_01HZX1A2B3C4D5E6F7G8H9J0K status: type: string description: Current status of the Information Request example: DRAFT enum: - DRAFT - PROCESSING_SUBMISSION - PENDING_REVIEW - COMPLETED - CANCELED subjectType: type: string description: Type of the entity the Information Request is associated with example: ENROLLMENT enum: - ENROLLMENT subjectId: type: string description: Identifier of the entity the Information Request is associated with example: subject-123 validationStatus: type: string description: Validation status of the Information Request data example: MISSING enum: - MISSING - VALID - INVALID decision: type: - string - 'null' description: >- Current manual review decision status for the Information Request, if it has been reviewed example: PENDING enum: - PENDING - APPROVED - REJECTED createdAt: type: string description: Timestamp when the Information Request was created example: '2026-04-01T12:00:00Z' format: date-time updatedAt: type: string description: Timestamp when the Information Request was last updated example: '2026-04-01T12:05:00Z' format: date-time ValidationError: type: object title: com.meridianpay.core.common.api.ValidationError description: >- Represents a validation error that occurred during the processing of a request to the Meridian API. One of the following types of validation errors may be present: InvalidFormat, InvalidValue, MissingValue, UnprocessableValue, UnexpectedVerificationError, MissingRequestBody, MissingPathParameter, MissingQueryParameter, or NotFound. Each validation error includes a reference to the field that caused the error and a message describing the error. oneOf: - $ref: '#/components/schemas/InvalidFormat' - $ref: '#/components/schemas/InvalidValue' - $ref: '#/components/schemas/MissingPathParameter' - $ref: '#/components/schemas/MissingQueryParameter' - $ref: '#/components/schemas/MissingRequestBody' - $ref: '#/components/schemas/MissingValue' - $ref: '#/components/schemas/NotFound' - $ref: '#/components/schemas/UnexpectedVerificationError' - $ref: '#/components/schemas/UnprocessableValue' discriminator: propertyName: type mapping: com.meridianpay.core.common.api.ValidationError.InvalidFormat: $ref: '#/components/schemas/InvalidFormat' com.meridianpay.core.common.api.ValidationError.InvalidValue: $ref: '#/components/schemas/InvalidValue' com.meridianpay.core.common.api.ValidationError.MissingPathParameter: $ref: '#/components/schemas/MissingPathParameter' com.meridianpay.core.common.api.ValidationError.MissingQueryParameter: $ref: '#/components/schemas/MissingQueryParameter' com.meridianpay.core.common.api.ValidationError.MissingRequestBody: $ref: '#/components/schemas/MissingRequestBody' com.meridianpay.core.common.api.ValidationError.MissingValue: $ref: '#/components/schemas/MissingValue' com.meridianpay.core.common.api.ValidationError.NotFound: $ref: '#/components/schemas/NotFound' com.meridianpay.core.common.api.ValidationError.UnexpectedVerificationError: $ref: '#/components/schemas/UnexpectedVerificationError' com.meridianpay.core.common.api.ValidationError.UnprocessableValue: $ref: '#/components/schemas/UnprocessableValue' InvalidFormat: type: object title: com.meridianpay.core.common.api.ValidationError.InvalidFormat description: The provided value exists, but its format is invalid for the field. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. InvalidValue: type: object title: com.meridianpay.core.common.api.ValidationError.InvalidValue description: >- The provided value is syntactically valid, but not accepted for the field. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. MissingPathParameter: type: object title: com.meridianpay.core.common.api.ValidationError.MissingPathParameter description: A required path parameter was not supplied. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. MissingQueryParameter: type: object title: com.meridianpay.core.common.api.ValidationError.MissingQueryParameter description: A required query parameter was not supplied. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. MissingRequestBody: type: object title: com.meridianpay.core.common.api.ValidationError.MissingRequestBody description: >- The request body is missing or does not contain the required non-null fields. properties: message: type: string description: A human-readable explanation of the validation failure. fieldRef: type: string MissingValue: type: object title: com.meridianpay.core.common.api.ValidationError.MissingValue description: A required value for the field was not provided. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. NotFound: type: object title: com.meridianpay.core.common.api.ValidationError.NotFound description: The referenced principal object was not found. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. UnexpectedVerificationError: type: object title: >- com.meridianpay.core.common.api.ValidationError.UnexpectedVerificationError description: A downstream verification step failed while checking the value. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. UnprocessableValue: type: object title: com.meridianpay.core.common.api.ValidationError.UnprocessableValue description: The provided value cannot be processed into a valid result. required: - fieldRef properties: fieldRef: type: string description: The field or parameter that triggered the validation error. message: type: string description: A human-readable explanation of the validation failure. ````