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POST
/
v1
/
uploads
/
{uploadId}
/
store
// POST https://api.signatureapi.com/v1/uploads/{uploadId}/store
// X-API-Key: key_test_...
// Content-Type: application/json

{
    "key": "contract-template-v2"
}

// HTTP Status Code 200

{
  "id": "upl_1sAAaVfabdt0esVjmSTmLA",
  "retention": "permanent",
  "key": "contract-template-v2",
  "url": "https://api.signatureapi.com/v1/uploads/upl_1sAAaVfabdt0esVjmSTmLA",
  "format": "pdf",
  "sha_256": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
  "size": 102400,
  "created_at": "2025-12-30T12:00:00.000Z"
}

Documentation Index

Fetch the complete documentation index at: https://signatureapi-daf4ee54.mintlify.app/llms.txt

Use this file to discover all available pages before exploring further.

Convert a temporary upload into a permanent upload. The file is moved to permanent storage and no longer expires. A unique key is required to identify the permanent upload. Use this endpoint when you want to reuse a file across multiple envelopes without re-uploading it each time. For example, store a company logo or a contract template that you reference repeatedly.
Once stored, the upload’s retention changes from temporary to permanent and the expires_at property is removed. The upload id and url remain the same.

​
Path Parameters

​
uploadId
string
required
The unique identifier of the upload to store.

​
Body Parameters

​
key
string
required
A unique identifier for the upload within your account. Only lowercase letters, numbers, hyphens, and underscores are allowed. Maximum 100 characters.
// POST https://api.signatureapi.com/v1/uploads/{uploadId}/store
// X-API-Key: key_test_...
// Content-Type: application/json

{
    "key": "acme-logo"
}

​
Returns

Returns a 200 OK status code and an upload object with retention set to permanent, or an error otherwise. 
// POST https://api.signatureapi.com/v1/uploads/{uploadId}/store
// X-API-Key: key_test_...
// Content-Type: application/json

{
    "key": "contract-template-v2"
}

// HTTP Status Code 200

{
  "id": "upl_1sAAaVfabdt0esVjmSTmLA",
  "retention": "permanent",
  "key": "contract-template-v2",
  "url": "https://api.signatureapi.com/v1/uploads/upl_1sAAaVfabdt0esVjmSTmLA",
  "format": "pdf",
  "sha_256": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
  "size": 102400,
  "created_at": "2025-12-30T12:00:00.000Z"
}