# Get invoice attachment

## Retrieves a specific invoice attachment by its ID.

> Depending on the Accept header, returns metadata (application/json) or downloads the file.\
> For external attachments (ERP PDFs), returns file content directly; for internal attachments, returns 301 redirect.

```json
{"openapi":"3.0.1","info":{"title":"Marketplace API","version":"5.0.5520-g4a7cef27"},"servers":[{"url":"https://api.platform.softwareone.com"}],"paths":{"/public/v1/billing/invoices/{invoiceId}/attachments/{id}":{"get":{"tags":["InvoiceAttachments"],"summary":"Retrieves a specific invoice attachment by its ID.","description":"Depending on the Accept header, returns metadata (application/json) or downloads the file.\nFor external attachments (ERP PDFs), returns file content directly; for internal attachments, returns 301 redirect.","parameters":[{"name":"id","in":"path","description":"The ID of the invoice attachment to retrieve.","required":true,"schema":{"type":"string"}},{"name":"select","in":"query","description":"Optional select statement to specify which fields to include in the response.","schema":{"type":"string"}},{"name":"invoiceId","in":"path","required":true,"schema":{"type":"string"}}],"responses":{"200":{"description":"OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/InvoiceAttachment"}}}},"301":{"description":"Moved Permanently"},"404":{"description":"Not Found","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetails"}}}},"406":{"description":"Not Acceptable","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ProblemDetails"}}}}}}}},"components":{"schemas":{"InvoiceAttachment":{"type":"object","properties":{"audit":{"allOf":[{"$ref":"#/components/schemas/PlatformObjectAudit"}]},"$meta":{"allOf":[{"$ref":"#/components/schemas/PlatformMetadata"}],"nullable":true},"revision":{"type":"integer","format":"int32"},"name":{"type":"string","description":"Name of the attachment."},"type":{"allOf":[{"$ref":"#/components/schemas/BillingAttachmentType"}],"description":"Specifies the type of the attachment, such as input, output, or general attachment."},"filename":{"type":"string","description":"Represents the name of the file associated with the attachment."},"size":{"type":"integer","description":"Indicates the size of the file in bytes.","format":"int64","nullable":true},"contentType":{"type":"string","description":"Represents the MIME type of the file content."},"description":{"type":"string","description":"Provides a description of the attachment."},"isDeleted":{"type":"boolean","description":"Indicates whether the attachment has been marked as deleted."},"id":{"type":"string","description":"The unique identifier of the attachment."},"invoice":{"type":"object","allOf":[{"$ref":"#/components/schemas/InvoiceRef"}]},"isExternal":{"type":"boolean","description":"Indicates whether the attachment is stored externally"}},"additionalProperties":false,"description":"Represents an attachment associated with an invoice in the billing system."},"PlatformObjectAudit":{"type":"object","properties":{"created":{"allOf":[{"$ref":"#/components/schemas/PlatformObjectEvent"}],"nullable":true},"updated":{"allOf":[{"$ref":"#/components/schemas/PlatformObjectEvent"}],"nullable":true}},"additionalProperties":false},"PlatformObjectEvent":{"type":"object","properties":{"at":{"type":"string","format":"date-time","nullable":true},"by":{"allOf":[{"$ref":"#/components/schemas/PlatformIdentity"}],"nullable":true}},"additionalProperties":false},"PlatformIdentity":{"type":"object","properties":{"id":{"type":"string"},"audit":{"allOf":[{"$ref":"#/components/schemas/PlatformObjectAudit"}]},"$meta":{"allOf":[{"$ref":"#/components/schemas/PlatformMetadata"}],"nullable":true},"name":{"type":"string"},"icon":{"type":"string","nullable":true},"revision":{"type":"integer","format":"int32"}},"additionalProperties":false},"PlatformMetadata":{"type":"object","properties":{"omitted":{"type":"array","items":{"type":"string"}}},"additionalProperties":false},"BillingAttachmentType":{"enum":["Attachment","Input","Output"],"type":"string","description":"Represents the type of billing attachment."},"InvoiceRef":{"type":"object","properties":{"revision":{"type":"integer","format":"int32"},"id":{"type":"string","description":"The unique identifier of the invoice."}},"additionalProperties":false,"description":"Represents an invoice entity in the billing system."},"ProblemDetails":{"type":"object","properties":{"type":{"type":"string","nullable":true},"title":{"type":"string","nullable":true},"status":{"type":"integer","format":"int32","nullable":true},"detail":{"type":"string","nullable":true},"instance":{"type":"string","nullable":true}},"additionalProperties":{}}}}}
```


---

# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.platform.softwareone.com/developer-resources/rest-api/billing-api/invoice/get-invoice-attachment.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.