Add a batch item

post

https://api.wingspan.app/v3/platform/batches/{batchId}/items

Appends exactly one BatchItem to a Created Batch. The request body is a single item, not an array, so validation is atomic and the endpoint never reports partial success. data must be the shape for the parent Batch's immutable type; any other shape is rejected with 422 ValidationError. For PayableImport, data.uniqueReferenceKey must be unique within the batch.

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Path Params

batchId

string

required

Body Params

Adds exactly one item to a Created batch. data must be the shape for the parent batch's type; arrays are not accepted.

externalId

string

Customer's own id for reconciliation.

metadata

object

Free-form key-value pairs. Max 50 keys; key length at most 40 characters; value length at most 500 characters. Where a list endpoint declares metadata filtering, it uses the QueryQL namespace via filter[metadata.{key}][eq]=value or filter[metadata.{key}][in][]=value. Endpoints that do not declare the dynamic Metadata filter do not support Metadata filtering.

data

required

Payload for one item, in the shape for the parent Batch's immutable type. The variant IS the data object — there is no wrapping per-type key. A payload in the shape for a different batch type is rejected with 422 ValidationError.

Headers

Idempotency-Key

string

length between 1 and 255

^[\x21-\x7e]{1,255}$

Optional idempotency token for authenticated POST and PATCH requests. Reusing the same key and body returns the cached response for 24 hours, except credential operations that explicitly document a 409 because one-time secret material is never cached; reusing it with a different body returns 409 IdempotencyKeyConflict. Use 1-255 printable ASCII characters.

X-Wingspan-Account

string

^(?:[A-Za-z0-9_.]{22}|[a-f0-9]{24})$

Select the Account for an Account-scoped operation. A direct ServiceAccount API key MUST supply this header, and the target must be within the ServiceAccount owner's or Authorization grant's Account boundary. A Person bearer may select an Account on which it has an active Stakeholder, and an Account session may select its bound Account (or a descendant only when the session explicitly includes descendants).

string

enum

Defaults to application/json

Generated from available response content types

Allowed:

Responses

Language

Credentials

Bearer

JWT

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Response

Click Try It! to start a request and see the response here! Or choose an example:

application/json

application/problem+json

201Batch item added

400Malformed request syntax

401Unauthenticated

403Forbidden

404Resource not found

422Validation error