!!! OC 3.0.3.5 & 3.0.3.6
!!! Mind the bug TWIG isn't working properly (not my fault)
!!! More info and hotfix via mod available here

Shows Company ID & VAT no. fields in:
Frontend: registration, address add/edit/view, order, order history, invoice, email
Backend: customer add/edit/view, order view, print invoice

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NEW version 3.0.x for OpenCart3.0.x - completely rewritten mod.
This vQmod is using the power of native custom fields. Values stored in these fields will be shown in the whole order process (addresses, order history, invoice, emails).
Feel free to contact me for more details /and support.

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v3.0.x is ready for any language
older versions are ready for these languages:
English - Co. ID / VAT ID
Deutsch - Steuer-Nr / UstIdNr
Français - N° de contribuable / N° intracommunautaire
Italiano - Codice fiscale / P.IVA
Español - NIF / Nº ID IVA
Slovenčina - IČO / DIČ/IČ DPH
Čeština - IČO / DIČ
Polski - REGON / NIP
Portuguese BR - NIF / Nº ID IVA

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Installation:
1. Main menu > Extensions > Extension installer
Upload the file „enjoy.cid.vat.v3.ocmod.zip“.

2. Main menu > Extensions > Modifications
Hit the blue icon „Refresh“

3. Main menu > Customers > Custom fields
Create two new fields Company ID and VAT number.
Location: Address
Type: Text
Value: leave empty
Required: optional
Status: Enabled
Sort order: I prefer CID & VAT after Company name field so the defaults for me are CID order 3 and VAT order 4

4. Main menu > System > Settings > Edit your store > Option tab
At the bottom of the Option tab you can find Company ID / VAT section. This is the magic part which pairs custom fields with the OCMod.

5. Check if the address formatting is not overriden in System > Localisation > Countries > find your country and edit.
The field Address format must be left empty. Address format is natively pre-fformatted by OpenCart.

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please, report any bugs to 5ulo@n-joy.sk first. Thank You