eINVOICING
  1. API Authentication
eINVOICING
  • eInvoicing Service
    • About Us
    • What We Offer
    • Changelog
    • On Boarding
    • FAQ (EN)
    • FAQ (GR)
    • eInvoicing Service API
      • API Authentication
        • API Key Authentication
          • /Authentication/login
            POST
        • Bearer Token Authentication
          • Authentication Login Bearer Token
            POST
          • Authentication Refresh
            POST
      • API Endpoints
        • API Validations
        • Sending a Document
          • Sending a Document
          • Mandatory and Optional (Best Practice) Fields Descriptions
          • Mobile Notifications
          • IAPR SIGN POLICY METHODS
          • QR OF THE DOCUMENT
          • Record Type
          • Invoice/json
            POST
          • /Invoice/credit
            POST
        • Purchase Orders for F&B
          • FnB Purchase Orders Documentation
          • Offline QR Code Implementation
          • Retrieve Open Order Documents (FnB)
            GET
        • Document Management
          • Retrieving a document
          • PDF Invoice as an Attachment
        • Alternative Currency Holding
          • ALTERNATIVE CURRENCY (AC)
        • Delivery Notes
          • Delivery Notes Documentation
          • /Invoice/cancelDeliveryNote
            POST
        • POS Integration
          • POS Integration
          • POS Offline QR Code Implementation
          • /PosSignatures/{issuerTin}
            POST
          • /Receipt
            POST
          • /PosTransactions/signpos
            POST
        • Delayed POS Payment
          • Delayed POS Payment
        • B2G Documents
          • B2G Documents
          • B2G Mandatory Fields
          • B2G Status response
          • B2G Soft Reject
          • RESEED INVOICE
          • BT-10 BuyerReference
          • B2G fields for ERP Configurator 3
          • ΕΓΚΥΚΛΙΟΣ ΠΡΟΣ ΠΑΡΟΧΟΥΣ-ΠΡΟΜΗΘΕΥΤΕΣ ΥΠΗΡΕΣΙΩΝ ΥΓΕΙΑΣ ΓΙΑ ΤΗΝ ΗΛΕΚΤΡΟΝΙΚΗ ΤΙΜΟΛΟΓΗΣΗ
          • /B2GInvoice/ReSeedInvoice
            POST
          • /B2GInvoice/GetLastStatus
            GET
      • JSON Structures & Payloads
        • EliseCoreDocument Structure
          • EliseCoreDocument Structure
        • Minimum & Conditional Fields
          • Minimum & Conditional Fields
        • Response Examples & Error Handling
          • Response Examples & Error Handling
      • Offline QR Code
        • Offline QR Code Instructions
      • Status MyData
        • MyData/status
          GET
      • Extra Functionalities
        • Archiver
          • Archiver Functionality
      • Terminology
        • Document Type Codes
        • VAT & TAX Codes
        • Country & Currency Codes
        • Measurement Unit Codes (IAPR & EN16931)
        • Self-Billing Remarks (IAPR)
        • Classification & Payment Method Codes (IAPR)
        • Special Invoice Category
      • VAT Validation
        • Greek VAT Check
        • EU VAT Check
      • Attachments
        • Attaching Media & PDFs
        • Invoice Document Upload (Invoice/File)
      • SOFTONE ERP Related Segments
        • SOFTONE Configurator
          • SOFTONE Configurator - B2G Mapping
    • eInvoicing Portal
      • Template Configuration (Default Template)
      • Single Sign-On (SSO)
        • Single Sign-on (SSO) Setup Instructions
        • Single Sign-On (SSO)
    • WIKI JSON Samples
      • 1.1 B2B
      • 1.3 B2B Sales Invoice Third Country
      • 5.2 B2B Credit Invoice Non-Associated
      • 2.1 B2B Service Rendered Invoice
      • 1.1 Debit B2G
      • 11.1 B2C Retail Sales Receipt
      • 11.4 Retail Sales Credit Note
  1. API Authentication

Bearer Token Authentication

BEARER TOKEN#

Our service supports JWT Bearer Authentication method. For you to receive your Access and Refresh tokens, you need to implement the following POST method.
Login method does not need to be authorized.
You will need to include in the body of your POST request, the VAT of the company and the API Key in order to get a successful response.
💡
Endpoint: https://einvoiceapiuat.impact.gr/Authentication/login
The accessToken received in the response is valid for 15 minutes. In order to refresh it you need to implement the method that is described in the section "Authentication Refresh".
Refresh POST request
💡
Endpoint: https://einvoiceapiuat.impact.gr/Authentication/refresh
Request Payload: “[token value from the refreshToken object]”
The response will be similar to the one received when issuing the access token. This request needs to be authenticated.
Insert your "accessToken" value in the "Authentication" param on the header of the POST call.
All requests to the API need to be authenticated by implementing JWT Bearer token authentication.
For example, to issue an invoice using the endpoint: https://einvoiceapiuat.impact.gr/invoice/json, the corresponding header would look like this:
Key: “Authorization”
Value: "Bearer<your_accessToken_here>"
Modified at 2025-07-14 07:04:45
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