To send e-invoices, you must first register as a sender. Go to: Send > Peppol
Enter all details. Contact information, but also your indentifiers, for example your VAT number. At the bottom you choose how to deliver the invoices: via API or e-mail. Enter the e-mail address with which the invoices are sent. Then click on "Request validation"
Your data will be validated. This usually takes no longer than a day. You will receive an e-mail message.
If you are validated, you can send invoices. This can be done in three ways: via the API (documentation), SFTP (also mentioned in the API documentation) or via e-mail:
You can find the e-mail address where you can send invoices:
Send > send.storecove.com
Make sure that the Peppol ID (Chamber of Commerce, VAT, etc.) of the recipient is in the UBL that you send to this e-mail address. Here's a list of possible indentifiers: https://www.storecove.com/docs/#_peppol_schemes_list