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[unreal current]

I can only add a VAT but I want add a SIRET number

[stuck basin]

You are referring to your Stripe Account Siret or collecting the customer Siret ?

According to the screenshot I think you are referring to add your own SIRET Number

You can add custom fields in your invoices, check this guide
https://stripe.com/docs/invoicing/customize#custom-fields

However it's not a global settings, you need to set this for each Invoice.

[unreal current]

Customer and Me on invoice and secondly I want add a field with possibilité for a customer to add his siret number in page paiement

Thanks for your help

[stuck basin]

So for your own SIRET you can use custom fields as mentioned above

with possibilité for a customer to add his siret number in page paiement
What Stripe Product are you using for this ?

[unreal current]

Ok but how add my siret number automatically in each invoice

[stuck basin]

There is no way to add a SIRET NUmber automatically/globally in each invocie

you need to add that using Custom Fields

[unreal current]

Ok thanks, for the client but for me ? I can't add my siret number in my paiement page for a client and I can't put my siret in invoice

I am block aha

[stuck basin]

You can set your SIRET/SIREN in you Stripe Tax settings:
https://dashboard.stripe.com/settings/taxation

However I'm not sure if it will be displayed in your invoices or not. I'm sure for the VAT Number but not for the SIRET. You can do a quick test

[unreal current]

Yes, siret number don't display in automatic invoice

[stuck basin]

but for me ?
For your side, you can set only the VAT number.

In the invoice settings:
https://dashboard.stripe.com/settings/billing/invoice

[unreal current]

I already add my siret in settings

[stuck basin]

So yes you can't add SIRET as a global settings

[unreal current]

If I add a siret in the section, is legale ?

And if the client complete the field siret in paiement page, this info is display in the automatic invoice ?

[stuck basin]

you can set your SIRET in the invoice fotter yes.

[stuck basin]

you need to make sure that the custom field "siret" is set at the customer level:
https://stripe.com/docs/api/customers/object#customer_object-invoice_settings-custom_fields
So that each automatic invoice for that customer, will have their SIRET.

[unreal current]

Ok very thanks