# @signature.digital/interfaces

Core TypeScript interfaces for the signature.digital contract management system. 📋

This package provides **200+ interfaces and types** covering every aspect of digital contract management – from basic contract structure to eIDAS-compliant signatures, identity verification, and legal compliance.

## Install

```bash
pnpm add @signature.digital/interfaces
```

## Usage

```typescript
import type {
  IPortableContract,
  IRole,
  IInvolvedParty,
  IParagraph,
  TContractStatus,
} from '@signature.digital/interfaces';
```

## Module Structure

The package is organized into focused modules:

| Module | Description |
|--------|-------------|
| `types.ts` | Foundation type aliases (90+ types) |
| `terms.ts` | Financial, time, and obligation terms |
| `signature.ts` | Signature data structures and fields |
| `identity.ts` | Identity verification system |
| `legal.ts` | TSA timestamps, blockchain anchoring, compliance |
| `versioning.ts` | Semantic versioning and change tracking |
| `collaboration.ts` | Comments, suggestions, presence |
| `lifecycle.ts` | Status workflow, audit logs, retention |
| `attachments.ts` | Exhibits, schedules, document bundles |
| `pdf.ts` | PDF generation configuration |
| `contract.ts` | Main `IPortableContract` interface |

## Type Categories

### 📋 Contract Classification

```typescript
type TContractCategory = 'employment' | 'service' | 'sales' | 'lease' | 'license' | 'partnership' | 'confidentiality' | 'financial' | 'real_estate' | 'intellectual_property' | 'government' | 'construction' | 'healthcare' | 'insurance' | 'other';

type TContractType = 'employment_full_time' | 'employment_part_time' | 'employment_minijob' | ... | string;

type TContractStatus = 'draft' | 'internal_review' | 'legal_review' | 'negotiation' | 'pending_approval' | 'pending_signature' | 'partially_signed' | 'signed' | 'executed' | 'active' | 'suspended' | 'renewal_pending' | 'expired' | 'terminated' | 'superseded' | 'cancelled' | 'voided';
```

### ✍️ Signature Types

```typescript
type TSignatureType = 'drawn' | 'typed' | 'click' | 'digital' | 'qualified' | 'biometric';
type TSignatureLegalLevel = 'simple' | 'advanced' | 'qualified';
type TSignatureStatus = 'pending' | 'captured' | 'verified' | 'timestamped' | 'complete' | 'revoked' | 'expired';
```

### 🪪 Identity Verification

```typescript
type TIdentityVerificationMethod = 'none' | 'email' | 'sms' | 'knowledge' | 'document_upload' | 'document_nfc' | 'document_ocr' | 'biometric_facial' | 'video_ident' | 'bankid' | 'eid' | 'third_party_idp';
type TVerificationConfidence = 'none' | 'low' | 'medium' | 'high' | 'verified';
type TIdentityDocumentType = 'passport' | 'national_id' | 'drivers_license' | 'residence_permit' | 'travel_document' | 'other';
```

### 💰 Financial Types

```typescript
type TPaymentFrequency = 'one_time' | 'daily' | 'weekly' | 'bi_weekly' | 'semi_monthly' | 'monthly' | 'bi_monthly' | 'quarterly' | 'semi_annually' | 'annually' | 'on_demand' | 'upon_completion' | 'milestone_based' | 'custom';
type TPaymentMethod = 'bank_transfer' | 'sepa_direct_debit' | 'credit_card' | 'check' | 'cash' | 'paypal' | 'crypto' | 'escrow' | 'letter_of_credit' | 'other';
```

### ⏱️ Time & Duration

```typescript
type TDurationUnit = 'hours' | 'days' | 'weeks' | 'months' | 'years' | 'indefinite';
type TRenewalType = 'none' | 'manual' | 'auto_renew' | 'evergreen' | 'option_to_renew';
type TTerminationReason = 'breach_of_contract' | 'mutual_agreement' | 'convenience' | 'non_performance' | 'insolvency' | 'force_majeure' | 'regulatory_change' | 'merger_acquisition' | 'other';
```

### ⚖️ Legal Compliance

```typescript
type TTimestampMethod = 'tsa' | 'blockchain' | 'qualified_tsa';
type TBlockchainNetwork = 'bitcoin' | 'ethereum' | 'polygon' | 'arbitrum' | 'optimism' | 'hyperledger' | 'private';
type THashAlgorithm = 'SHA-256' | 'SHA-384' | 'SHA-512' | 'Keccak-256';
type TSignatureAlgorithm = 'RSA-SHA256' | 'RSA-SHA384' | 'RSA-SHA512' | 'ECDSA-P256' | 'ECDSA-P384' | 'Ed25519';
```

## Key Interfaces

### IPortableContract

The main contract interface that ties everything together:

```typescript
interface IPortableContract {
  id: string;
  title: string;
  context: string;
  metadata: IContractMetadata;
  availableRoles: IRole[];
  involvedParties: IInvolvedParty[];
  paragraphs: IParagraph[];
  variables: IVariable[];
  signatureFields: ISignatureField[];
  financialTerms: IFinancialTerms;
  timeTerms: ITimeTerms;
  obligationTerms: IObligationTerms;
  priorContracts: IPriorContractReference[];
  attachments: IContractAttachment[];
  versionHistory: IVersionHistory;
  collaborators: ICollaborator[];
  commentThreads: ICommentThread[];
  suggestions: ISuggestion[];
  lifecycle: IDocumentLifecycle;
  auditLog: IAuditLog;
  pdfConfig?: IPdfGenerationConfig;
  // ... timestamps, organization, integrations
}
```

### ISignature

Complete signature with data, metadata, and verification:

```typescript
interface ISignature {
  id: string;
  signatureType: TSignatureType;
  legalLevel: TSignatureLegalLevel;
  data: TSignatureData; // Discriminated union
  metadata: ISignatureMetadata;
  consents: IConsent[];
  auditTrail: ISignatureAuditEntry[];
  status: TSignatureStatus;
}
```

### IIdentityVerificationResult

Full identity verification outcome:

```typescript
interface IIdentityVerificationResult {
  id: string;
  status: TIdentityVerificationStatus;
  confidence: TVerificationConfidence;
  confidenceScore: number;
  methodsAttempted: TIdentityVerificationMethod[];
  verifiedIdentity?: IVerifiedIdentity;
  documentVerification?: IIdentityDocument;
  facialVerification?: IFacialVerification;
  thirdPartyVerification?: IThirdPartyVerification;
  // ... timestamps, failures, audit trail
}
```

## Factory Functions

Each module provides factory functions for creating properly initialized objects:

```typescript
import {
  createEmptyContract,
  createRole,
  createParagraph,
  createEmptyFinancialTerms,
  createInitialVersion,
  createCommentThread,
  createDefaultPdfConfig,
  // ... 30+ factory functions
} from '@signature.digital/interfaces';
```

## Dependencies

- `@tsclass/tsclass` – Business entity types (`TContact`, `IAddress`, `IPdf`, etc.)

## License and Legal Information

This repository contains open-source code licensed under the MIT License. A copy of the license can be found in the [LICENSE](../LICENSE) file.

**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.

### Trademarks

This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH or third parties, and are not included within the scope of the MIT license granted herein.

Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines or the guidelines of the respective third-party owners, and any usage must be approved in writing. Third-party trademarks used herein are the property of their respective owners and used only in a descriptive manner, e.g. for an implementation of an API or similar.

### Company Information

Task Venture Capital GmbH
Registered at District Court Bremen HRB 35230 HB, Germany

For any legal inquiries or further information, please contact us via email at hello@task.vc.

By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.