# Resources: Guides & Articles for Your Business | Wrapp

> How-to guides for Wrapp, practical myDATA and invoicing guides, and regulatory news. All in one place.
>
> AI-friendly Markdown version. HTML version: https://wrapp.ai/en/resources
> EL version: https://wrapp.ai/el/resources.md

## Blog

Articles and guides on myDATA, invoicing, tax and running your business

- [Mandatory e-invoicing in Greece from 1 October 2026: deadlines, penalties and what to do now](https://wrapp.ai/en/resources/mandatory-e-invoicing-greece-october-2026) ([.md](https://wrapp.ai/en/resources/mandatory-e-invoicing-greece-october-2026.md))
- [Greece's 2026 Farm Subsidy Application on myAGRO: Which Expense Documents Count](https://wrapp.ai/en/resources/greece-farm-subsidy-2026-myagro-invoices) ([.md](https://wrapp.ai/en/resources/greece-farm-subsidy-2026-myagro-invoices.md))
- [Didn't File a Greek Tax Return? How AADE's Estimated Assessment Works and What It Costs](https://wrapp.ai/en/resources/greece-estimated-tax-assessment-non-filers) ([.md](https://wrapp.ai/en/resources/greece-estimated-tax-assessment-non-filers.md))
- [Imputed (Deemed) Income in Greece: How to Dispute It and Cut Your Tax (2026)](https://wrapp.ai/en/resources/imputed-income-greece-dispute-guide) ([.md](https://wrapp.ai/en/resources/imputed-income-greece-dispute-guide.md))
- [Greek Tax Returns 2026: E3 Form, New Activity Codes (KAD) and myDATA](https://wrapp.ai/en/resources/greek-tax-returns-2026-e3-kad-mydata) ([.md](https://wrapp.ai/en/resources/greek-tax-returns-2026-e3-kad-mydata.md))
- [Hospitality platforms and myDATA: why issuing runs through a ΥΠΑΗΕΣ provider](https://wrapp.ai/en/resources/hospitality-platform-mydata-ypahes-provider) ([.md](https://wrapp.ai/en/resources/hospitality-platform-mydata-ypahes-provider.md))
- [How SaaS & ERP Platforms Become myDATA-Compliant via API](https://wrapp.ai/en/resources/mydata-api-integration-saas-erp) ([.md](https://wrapp.ai/en/resources/mydata-api-integration-saas-erp.md))
- [How to Level Up Your Ecommerce in 2026](https://wrapp.ai/en/resources/ecommerce-level-up-2026) ([.md](https://wrapp.ai/en/resources/ecommerce-level-up-2026.md))
- [10 Reasons Your Business Might Not Make It and How to Build Resilience](https://wrapp.ai/en/resources/10-reasons-business-resilience) ([.md](https://wrapp.ai/en/resources/10-reasons-business-resilience.md))
- [E-invoicing: Why Every Small Business Wins by Starting Today](https://wrapp.ai/en/resources/e-invoicing-benefits-small-business) ([.md](https://wrapp.ai/en/resources/e-invoicing-benefits-small-business.md))
- [A Short Guide to the All-in-One Devices Replacing Legacy Cash Registers](https://wrapp.ai/en/resources/all-in-one-pos-cash-register-replacement) ([.md](https://wrapp.ai/en/resources/all-in-one-pos-cash-register-replacement.md))

## Digitisation

What actually changes when you digitise your business, sector by sector, from daily operations through to the receipt

- [Real estate agency: how to connect Real Status with Wrapp](https://wrapp.ai/en/resources/connect-wrapp-real-status) ([.md](https://wrapp.ai/en/resources/connect-wrapp-real-status.md))
- [Restaurant digitisation in Greece: from the handheld order to the receipt](https://wrapp.ai/en/resources/restaurant-digitisation-greece-order-to-receipt) ([.md](https://wrapp.ai/en/resources/restaurant-digitisation-greece-order-to-receipt.md))
- [Retail and e-commerce digitisation: from the order to the invoice](https://wrapp.ai/en/resources/retail-ecommerce-digitisation-greece-order-to-invoice) ([.md](https://wrapp.ai/en/resources/retail-ecommerce-digitisation-greece-order-to-invoice.md))

## Issuing Documents

Everything about issuing invoices and receipts

- [VAT Exemption Articles in Greece: the Updated List (Law 5144/2024)](https://wrapp.ai/en/resources/vat-exemption-articles-greece) ([.md](https://wrapp.ai/en/resources/vat-exemption-articles-greece.md))
- [How to Issue an Invoice or Receipt in Wrapp](https://wrapp.ai/en/resources/how-to-issue-an-invoice) ([.md](https://wrapp.ai/en/resources/how-to-issue-an-invoice.md))
- [How to Issue a Linked Credit Invoice](https://wrapp.ai/en/resources/issue-credit-invoice) ([.md](https://wrapp.ai/en/resources/issue-credit-invoice.md))
- [How to Charge the Climate Crisis Resilience Fee](https://wrapp.ai/en/resources/climate-resilience-fee) ([.md](https://wrapp.ai/en/resources/climate-resilience-fee.md))
- [How to Create a Payment Receipt](https://wrapp.ai/en/resources/payment-receipt) ([.md](https://wrapp.ai/en/resources/payment-receipt.md))
- [How to Change an Invoice's Payment Status](https://wrapp.ai/en/resources/change-invoice-payment-status) ([.md](https://wrapp.ai/en/resources/change-invoice-payment-status.md))
- [How to Use Filters to Find Specific Documents](https://wrapp.ai/en/resources/invoice-search-filters) ([.md](https://wrapp.ai/en/resources/invoice-search-filters.md))
- [How to Issue a Simplified Invoice](https://wrapp.ai/en/resources/simplified-invoice) ([.md](https://wrapp.ai/en/resources/simplified-invoice.md))
- [How to Issue a Delivery Note](https://wrapp.ai/en/resources/delivery-note) ([.md](https://wrapp.ai/en/resources/delivery-note.md))
- [Invoicing a Customer Outside the EU from Greece](https://wrapp.ai/en/resources/invoice-non-eu-third-country-greece) ([.md](https://wrapp.ai/en/resources/invoice-non-eu-third-country-greece.md))
- [Intra-Community Invoicing from Greece, With and Without VAT](https://wrapp.ai/en/resources/intra-community-invoice-greece) ([.md](https://wrapp.ai/en/resources/intra-community-invoice-greece.md))

## Account Setup

Everything about configuring your account

- [How to Submit the YPAHES Provider Declaration](https://wrapp.ai/en/resources/ypahes-provider-declaration) ([.md](https://wrapp.ai/en/resources/ypahes-provider-declaration.md))
- [How to Add Your Bank Account Details](https://wrapp.ai/en/resources/add-bank-account-details) ([.md](https://wrapp.ai/en/resources/add-bank-account-details.md))
- [How to Bulk-Import Your Products and Services](https://wrapp.ai/en/resources/bulk-import-products-services) ([.md](https://wrapp.ai/en/resources/bulk-import-products-services.md))
- [How to Add Your Company Logo](https://wrapp.ai/en/resources/add-company-logo) ([.md](https://wrapp.ai/en/resources/add-company-logo.md))
- [How to Enable Customer Lookup by VAT Number (TaxisNet)](https://wrapp.ai/en/resources/customer-vat-lookup-taxisnet) ([.md](https://wrapp.ai/en/resources/customer-vat-lookup-taxisnet.md))
- [AADE Special Codes: Enabling VAT Number Lookup Through Taxis](https://wrapp.ai/en/resources/aade-special-codes-vat-lookup-setup) ([.md](https://wrapp.ai/en/resources/aade-special-codes-vat-lookup-setup.md))
- [How to Create Your Wrapp Account](https://wrapp.ai/en/resources/create-account) ([.md](https://wrapp.ai/en/resources/create-account.md))
- [How to Create a New Billing Book (Document Series)](https://wrapp.ai/en/resources/create-billing-book) ([.md](https://wrapp.ai/en/resources/create-billing-book.md))
- [How to Cancel Your Subscription and Stop Automatic Renewals](https://wrapp.ai/en/resources/cancel-wrapp-subscription) ([.md](https://wrapp.ai/en/resources/cancel-wrapp-subscription.md))
- [How to Renew Your Subscription After It Expires](https://wrapp.ai/en/resources/renew-wrapp-subscription) ([.md](https://wrapp.ai/en/resources/renew-wrapp-subscription.md))

## Public Sector Invoices (B2G)

Issuing invoices to Greek public sector entities (B2G)

- [B2G Invoices: Finding the Extra Fields Required for Greek Public Sector Billing](https://wrapp.ai/en/resources/b2g-invoice-required-fields) ([.md](https://wrapp.ai/en/resources/b2g-invoice-required-fields.md))
- [How to Submit the B2G Provider Declaration](https://wrapp.ai/en/resources/b2g-provider-declaration) ([.md](https://wrapp.ai/en/resources/b2g-provider-declaration.md))
- [How to Invoice EOPYY (the Greek National Health Fund)](https://wrapp.ai/en/resources/eopyy-invoice) ([.md](https://wrapp.ai/en/resources/eopyy-invoice.md))
- [How to Issue a B2G Invoice to the Greek Public Sector](https://wrapp.ai/en/resources/issue-b2g-invoice) ([.md](https://wrapp.ai/en/resources/issue-b2g-invoice.md))

## Digital Clientele

How to use the Digital Clientele registry

- [How the Digital Clientele Registry (Psifiako Pelatologio) Works](https://wrapp.ai/en/resources/how-digital-clientele-works) ([.md](https://wrapp.ai/en/resources/how-digital-clientele-works.md))

## POS

POS interconnection

- [NBG Pay POS integration with EDPS](https://wrapp.ai/en/resources/nbg-pay-pos-edps) ([.md](https://wrapp.ai/en/resources/nbg-pay-pos-edps.md))
- [Connecting Wrapp Terminal to NBG Pay Tap on Mobile (Mellon)](https://wrapp.ai/en/resources/wrapp-terminal-nbg-tap-on-mobile) ([.md](https://wrapp.ai/en/resources/wrapp-terminal-nbg-tap-on-mobile.md))
- [How to Connect a Viva softPOS to Wrapp](https://wrapp.ai/en/resources/connect-viva-softpos) ([.md](https://wrapp.ai/en/resources/connect-viva-softpos.md))
- [How to Connect Your All-in-One POS Device to Wrapp](https://wrapp.ai/en/resources/connect-all-in-one-device) ([.md](https://wrapp.ai/en/resources/connect-all-in-one-device.md))

## API & Developers

Payload-level guides to the REST API: fields, codes, validation rules and real JSON examples, for ERPs, software houses and teams integrating document issuing.

- [myDATA fuel codes (fuel_code): issuing fuel station documents through the API](https://wrapp.ai/en/resources/mydata-fuel-codes-api-fuel-stations) ([.md](https://wrapp.ai/en/resources/mydata-fuel-codes-api-fuel-stations.md))

## myDATA reference tables

The myDATA code lists the API uses

- [Invoice types](https://wrapp.ai/en/resources/invoice-types) ([.md](https://wrapp.ai/en/resources/invoice-types.md))
- [VAT exemption reasons](https://wrapp.ai/en/resources/vat-exemption-reasons) ([.md](https://wrapp.ai/en/resources/vat-exemption-reasons.md))
- [Permitted VAT values (vat_rate)](https://wrapp.ai/en/resources/vat-rates) ([.md](https://wrapp.ai/en/resources/vat-rates.md))
- [Quantity types](https://wrapp.ai/en/resources/quantity-types) ([.md](https://wrapp.ai/en/resources/quantity-types.md))
- [Income / expense classification categories](https://wrapp.ai/en/resources/classification-categories) ([.md](https://wrapp.ai/en/resources/classification-categories.md))
- [Income / expense classification types](https://wrapp.ai/en/resources/classification-types) ([.md](https://wrapp.ai/en/resources/classification-types.md))
- [Other taxes categories](https://wrapp.ai/en/resources/other-taxes) ([.md](https://wrapp.ai/en/resources/other-taxes.md))
- [Stamp duty categories](https://wrapp.ai/en/resources/stamp-duty) ([.md](https://wrapp.ai/en/resources/stamp-duty.md))
- [Withholding tax categories](https://wrapp.ai/en/resources/withholding-taxes) ([.md](https://wrapp.ai/en/resources/withholding-taxes.md))
- [Entity types](https://wrapp.ai/en/resources/entity-types) ([.md](https://wrapp.ai/en/resources/entity-types.md))
- [Tax types](https://wrapp.ai/en/resources/tax-types) ([.md](https://wrapp.ai/en/resources/tax-types.md))
- [Purpose of movement](https://wrapp.ai/en/resources/purpose-of-movement) ([.md](https://wrapp.ai/en/resources/purpose-of-movement.md))
- [Reverse delivery note purpose](https://wrapp.ai/en/resources/reverse-delivery-purpose) ([.md](https://wrapp.ai/en/resources/reverse-delivery-purpose.md))

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