> For the complete documentation index, see [llms.txt](https://docs.platform.softwareone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.platform.softwareone.com/developer-resources/rest-api/billing-api/invoice/create-invoice-attachment.md).

# Create invoice attachment

## Creates a new invoice attachment.

> Uploads a file as multipart/form-data with optional properties (name, description).

```json
{"openapi":"3.0.1","info":{"title":"Marketplace API","version":"5.0.5661-g83ffb015"},"servers":[{"url":"https://api.platform.softwareone.com"}],"paths":{"/public/v1/billing/invoices/{invoiceId}/attachments":{"post":{"tags":["InvoiceAttachments"],"summary":"Creates a new invoice attachment.","description":"Uploads a file as multipart/form-data with optional properties (name, description).","parameters":[{"name":"invoiceId","in":"path","description":"The ID of the invoice to which the attachment belongs.","required":true,"schema":{"type":"string"}}],"requestBody":{"content":{"multipart/form-data":{"schema":{"type":"object","properties":{"attachment":{"type":"object","properties":{"Name":{"type":"string","description":"The name of the attachment."},"Description":{"type":"string","description":"The description of the attachment."}},"description":"Json representation of the attachment"},"file":{"type":"string","description":"The file of the attachment.","format":"binary"}}},"encoding":{"attachment":{"contentType":"application/json"},"file":{"contentType":"application/octet-stream"}}}}},"responses":{"201":{"description":"Created","content":{"application/json":{"schema":{"$ref":"#/components/schemas/InvoiceAttachment"}}}},"400":{"description":"Bad Request","content":{"application/json":{"schema":{"$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":[{"$ref":"#/components/schemas/PlatformObjectEvent"}],"nullable":true}},"additionalProperties":false},"PlatformObjectEvent":{"type":"object","properties":{"at":{"type":"string","format":"date-time","nullable":true},"by":{"type":"object","allOf":[{"$ref":"#/components/schemas/PlatformIdentityRef"}]}},"additionalProperties":false},"PlatformIdentityRef":{"type":"object","properties":{"id":{"type":"string"},"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":{}}}}}
```


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