Prepare a NEW free-signature document from one PDF without sending it. Accept Base64, a public HTTPS download URL, an existing SELISE storage file ID, a reference from the binary upload endpoint, or a ChatGPT attachment through chatgptFile. New bytes are uploaded; existing storage/upload references are reused. Use when preparation is requested or placements are not ready; do not call again for an existing or pending document. Provide exactly ONE file source: documentBase64 (raw standard Base64), documentUrl (public HTTPS PDF download URL, including a temporary signed URL), storageFileId (an existing SELISE storage PDF accessible to this server), uploadId (the exact short-lived reference returned by this server's HTTP POST /uploads), or chatgptFile (the host-provided file object for a PDF attached in ChatGPT). In ChatGPT, use chatgptFile via the declared file-input integration for a user attachment; its download_url and file_id are supplied by the host. Do not combine sources, invent file content or IDs, or pass local paths to the server. A bare ChatGPT attachment ID is not a documentUrl or storageFileId. Other clients can continue using the four generic sources. For binary upload, POST multipart/form-data with one file part named file to /uploads on this server's HTTP deployment, then use the returned uploadId before expiresAt; uploading does not prepare or send a document. Raw application/pdf uploads with a fileName query parameter are also accepted. The uploadId is valid for one hour; keep it private. Source PDFs are validated consistently. documentUrl must return PDF bytes without additional authentication headers; the server does not use browser cookies, login pages, or private-network URLs. It follows at most three public HTTPS redirects. Storage files and upload references are reused without a second upload. Supply fileName ending in .pdf and the normal preparation fields for every method. A file reference is not a documentId and does not mean preparation has completed. Maximum actual PDF size for every source on this server: 26214400 bytes, excluding Base64 encoding or multipart overhead. PDFs must be readable, unencrypted, and have supported page geometry. File-source retrieval and validation happen before preparation. Never fabricate file content. ownerEmail must match one of the signatories' emails. Signatory emails must be unique (case-insensitive). Provide a positive integer signingOrder for every signatory or omit it for all; role defaults to signer. Ask for missing participant details; do not invent people or change their intended roles to satisfy validation. Role values and behavior: signer signs the contract; reviewer is a view-only participant who can see the contract but has no action to perform; approver reviews and approves the contract without signing. Map a requested viewer to reviewer, and a requested reviewer who must approve to approver. The literal value viewer is not accepted. If the intended action is unclear, ask before choosing a role. No coordinates are needed for this tool. Returns prepared only after preparation is confirmed, or pending after acceptance without confirmation. prepared does not mean sent or signed. Once prepared (or preparation_success is observed), use send_prepared_signature_document with the returned documentId/fileId and verified placements when sending is requested. Keep returned documentId, fileId, operationId, and trackingId when present. pending means accepted but completion is unconfirmed: check get_signature_document_status with documentId instead of resubmitting. UNKNOWN_OUTCOME, a timeout, or a lost response may follow a successful submission; do not automatically repeat a preparation or send call. Inspect status when an ID is available; an empty status list does not make a retry safe. INVALID_REQUEST means inputs need correction; REQUEST_FAILED gives a referenceId for diagnosis. If the cause is unclear, ask for clarification or use the referenceId rather than guessing. Repeating a preparation can create another document. Use only the declared fields. Ask for missing facts instead of inventing values. Service credentials are configured on the server and must not be included in tool arguments.