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Add a Submodule to a Module version

Attaches an existing Module version as a reusable Submodule of the parent version. Requires an Idempotency-Key. Repeating the same parent/child catalog relationship returns the existing connection. cascadeChoice decides how linked curricula receive term-specific occurrences. Requires Module Hierarchy to be enabled. Scoped to your integration’s institution via Basic Auth credentials.

POST/modules/{id}/versions/{versionId}/submodules
Authorization
AuthorizationBasic auth · headerrequired

Basic Auth with clientId as username and clientSecret as password

Path parameters
idstringrequired
versionIdstringrequired
Header parameters
Idempotency-Keystringrequired
Request body
requiredapplication/json
childModuleVersionIdstringrequired

Existing child Module version to attach.

cascadeChoicestringrequired
Allowed:propagateskipreset
ectsContributionModestring

Optional. Defaults to CONTRIBUTE_TO_PARENT when omitted.

Allowed:CONTRIBUTE_TO_PARENTSTANDALONE
isRequiredForPassboolean

Optional. Defaults to true when omitted.

Responses
201

Submodule connection created or replayed

dataSubmoduleConnectionrequired

Catalog connection from one parent Module version to a reusable Submodule version. Curriculum and study-plan term occurrences are cascade output, not API input. The internal global catalog study-period sentinel is never exposed.

Show properties
connectionIdstringrequired
parentModuleIdstringrequired
parentModuleVersionIdstringrequired
childModuleIdstringrequired
childModuleVersionIdstringrequired
childModuleNamestringrequired
childModuleCodestring | nullrequired
childVersionstringrequired
ectsContributionModestringrequired

Whether the Submodule contributes ECTS to the parent Module or stands alone.

Allowed:CONTRIBUTE_TO_PARENTSTANDALONE
isRequiredForPassbooleanrequired

Whether this Submodule is required for the parent Module pass rule.

createdAtstring<date-time>required
updatedAtstring<date-time>required
metaResponseMetarequired
Show properties
requestIdstringrequired
timestampstring<date-time>required
versionstringrequired
Allowed:v4
watermarkstring<date-time>

Present on GET /users?updatedSince= pages. Taken at the first page minus a 60s overlap. Bound into pagination.next_cursor. Use it as the next updatedSince after deduping by user id. Delivery is inclusive >= and at-least-once.

400

Bad Request

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
401

Unauthorized

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
404

Not Found

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
409

Conflict — duplicate email or membership code (body includes existingUserId when known), a time-tracking session that is already running (activeSession), a time-tracking interval that overlaps an existing log (conflictingLog), idempotency key reused with a different body (idempotency_key_reused), or concurrent request with the same key still in progress (idempotency_key_in_progress)

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
422

Unprocessable Entity — validation or business rule error

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
429

Too Many Requests — 1000 requests per minute per institution. Includes X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset (ISO-8601), and Retry-After (seconds).

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
500

Internal Server Error

typestringrequired
Allowed:error
codestringrequired
Allowed:bad_requestunauthorizedforbiddenresource_not_foundconflictvalidation_failedidempotency_key_reusedidempotency_key_in_progressservice_unavailableretryablerate_limit_exceededinternal_error
titlestringrequired
statusintegerrequired
detailstringrequired
instancestring
errorsobject[]
Show properties
Array of object
fieldstring
messagestring
existingUserIdstring

Present on 409 email or membership-code conflicts. The user id that already holds the email or code.

activeSessionobject

Present on time-tracking start 409 when a session is already running. Stop this session, then retry start.

Show properties
idstringrequired
startTimestring<date-time>required
conflictingLogobject

Present on time-tracking 409 when the interval being written overlaps an existing log or open session. Start uses [punch, ∞). Stop uses [sessionStart, stop). endTime is null while that session is still open.

Show properties
idstringrequired
startTimestring<date-time>required
endTimestring<date-time> | nullrequired
Try it
Server
Authorization
Parameters
Bodyapplication/json
Request
curl -X POST 'https://fuxam.app/api/v4/modules/string/versions/string/submodules' \
  -H 'Authorization: Basic YOUR_CREDENTIALS' \
  -H 'Idempotency-Key: string' \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "childModuleVersionId": "cmv_qa_api_child_a_1",
  "cascadeChoice": "propagate",
  "ectsContributionMode": "CONTRIBUTE_TO_PARENT",
  "isRequiredForPass": true
}'
Response
{
  "data": {
    "connectionId": "cmc_parent_child_a",
    "parentModuleId": "cm_qa_api_parent",
    "parentModuleVersionId": "cmv_qa_api_parent_1",
    "childModuleId": "cm_qa_api_child_a",
    "childModuleVersionId": "cmv_qa_api_child_a_1",
    "childModuleName": "QA API Child A",
    "childModuleCode": "QA-CHILD-A",
    "childVersion": "1.0",
    "ectsContributionMode": "CONTRIBUTE_TO_PARENT",
    "isRequiredForPass": true,
    "createdAt": "2026-08-23T10:00:00.000Z",
    "updatedAt": "2026-08-23T10:00:00.000Z"
  },
  "meta": {
    "requestId": "req_abc123",
    "timestamp": "2026-06-26T00:00:00.000Z",
    "version": "v4"
  }
}

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