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Hello,
I made the following modifications to the plug-in:
1. I created a template of the “minimal” invoice according to the instructions in the FAQ.
2. I included a new custom field according to the indications provided by the author.
When generating a new invoice, the invoice appears, but with the message “There has been a critical error on this website. Please check your site admin email inbox for instructions.” in the place where the value of the key of the custom field should appear.
The key of the custom field is “bsale_docto_folio_boleta”. It is a value automatically generated by a plug-in when the order status changes to processing.
In the following Drive file you will find the logs of the fatal error extracted in WooCommerce> Status> Logs, the edited template file of invoice and screenshot of the custom field and invoice with error.
https://drive.google.com/drive/folders/13cRxXWIiU0W-EMkZ5nznTSD-C1wWHikP?usp=sharing
Thanks x1000 for your help.