woocommerce virtual generated PDF - wordpress

I want to sell generated PDF on my WordPress/woo commerce site:
Each product has to be a generated PDF containing unique QR code.
Typically, the user will buy this product on the website and will receive by email later this generated PDF (this pdf is not the invoice!) containing this unique QRCode.
How can I create virtual products that are automatically generated and unique?
(to later send by email).
[edit]
I am really asking which PHP files should I modify to be able to do so?
cheers

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How to attach user comments to order as PDF

In my WooCommerce website, users can enter comments - such as a gift message. I then integrate with a 3rd party warehouse software called MintSoft. My warehouse have told me the only way they can include gift messages is if I attach the message as a printable PDF/DOCX file to the order. I assume if I attach a file to the order in WooCommerce, that will feed down to MintSoft.
So my question is, how can - upon order execution - I generate a PDF/DOCX file based on a 6x4 inch template, populating it with the user comments field from the WooCommerce order, then attach that generated file to the order in WooCommerce?
I have searched for a plugin that does this, but no luck.

One product with multiple instances and sell each instance once

I'm using Wordpress and Woocommerce to make an online store. I want to sell some accounts (username and password). For example, the product name would be "Foo" and contains 100 files each containing an account information. So, the product should appear once in store and on each sale one file should be delivered to user. How can I do this? Is there any add-on for this purpose?
Thanks in advance.
You need to be looking at "Digital Downloads". For example a rough overview on this is here:
https://docs.woocommerce.com/document/digital-downloadable-product-handling/
And then to create the "different" files you will use product "Variations", where each variation would be a file.

Is there a way to obfuscate Wordpress file download URLs

Im using ACF to associate a custom file field to WooCommerce on my site. That field will receive the customers invoice PDF once the order is completed. My problem is the files have a sequence numbering, which is helpful to keep so I can quickly identify them in the admin interface, but I don't want my customers to able to guess the numbering and easily open other invoices.
Is there any way to add a small obfuscation so that the URLs don't show any sequence any obvious sequence pattern?

Display Great Plains invoice report from website

We're trying to display invoice reports from great plains through our website. We're looking to have gp store the invoice report pdf once they are created and emailed. We are using gp 2010 and are currently using the built in feature that allows us to send an email to the customer containg the invoice as a pdf.
I'm on step one here, being that I'm trying to get a hold of the GP invoice reports. It appears that they may be created in GP on the fly and are not saved to any folder that I can access. Does anyone know where these invoice files are stored? I would think it has to store them somewhere on the client machine or somewhere else in order for the email to attach the file.
Here is a similar related post on the Dynamics forum, the answer here is concerning. They told him to use a dexterity customization to accomplish the saving of the invoice pdf.
http://community.dynamics.com/gp/f/32/t/106071.aspx
The GP invoices are generated on the fly and not stored permanently on disk.
All of the data you need to generate the invoice is contained in the company database in Dynamics GP. My advice to you would be to create your own invoice in a technology compatible with your website such as SSRS or ASP.NET, etc. Then you can generate an invoice on the fly from the data in the database.
Basically we never found where GP is storing the invoice PDFs that it emails, and the decision was made that they didn't want to create the reports on the fly. They wanted to store the original report from GP. So that left us with 2 choices.
Have GP save all of the invoices in a batch to a single word file. This option is built into GP, when user goes to print the invoices (or email them) there is also a check box that allows them to save the invoices of the entire batch to a single word file. We then would have to separate this file into each separate invoice document using c# or something.
Use Exchange web services to access the emails and download the attachments to a folder. This requires that we BCC every email with the account we will get to using the exchange web services. This is the option we ended up going with.

Combining content types into a single PDF in Drupal 6

So, I'm working on a Drupal 6 project that ultimately replaces a big, complex Excel spreadsheet with a workflow as such:
Customer books an appointment via the Bookings API
Employee goes to customer and does a bunch of measurements
Employee enters measurements into either an uploaded Excel spreadsheet or a web-based form
Website generates a PDF with measurement sheet and the output from the Invoice module
Customer receives an email with link to watermarked version of PDF.
Customer pays online and receives link to unwatermarked PDF.
My questions are:
What is the best way to go about Part 3 (Such that the data can be used by Parts 4-6)? CCK fields and a custom content type?
What is the best way to combine content types (I.e., "Measurements" custom content type with "Invoice" content type) into a single PDF?
Bonus Marks: Any way to auto-populate Invoice module content types?
Any help will be muchly appreciated!
You are actyally trying to sell a product with customisable input (comparable to a t-shirt with a custom print, but instead of using a custom picture, you use custom data).
Here is what I did for a comparable project:
Use ubercart: http://www.ubercart.org/
Use the UC Node Checkout extension, this allows you to link a node to an ubercart product and use the information in the node for your customised product: http://drupal.org/project/uc_node_checkout
Here's an excellent walkthrough for UC Node Checkout: http://drupaleasy.com/blogs/ultimike/2009/03/event-registration-ubercart
You can use FileField for uploading the Excel file: http://drupal.org/project/filefield
Make sure you use the Transliteration module: http://drupal.org/project/transliteration
The PECL upload progress is also nice to have
You will also need a csv reader, but haven't tried this yet
Finally, to give a link to the file, you can use the Ubercart selling files mechanism: http://www.ubercart.org/docs/user/3345/selling_files
Bonus:
You can use the Automatic node tite module to autoname a node: http://drupal.org/project/auto_nodetitle
For other fields, you can use the token mechanism: http://drupal.org/project/token
I ended up using:
a. Storm for CRM functionality
b. Simple Payments for Storm Invoice payment
c. Print module for PDF output
d. Calendar (+ Views) for appointment booking (Used internally; stage 1 changed to "employee sets up appointment" in Storm Project)
e. CCK + Flexifield for the measurement sheet content type
f. Custom-written module to pass cost values to Storm and automate tasks between Storm/CCK measurement sheet.
Ubercart really is overkill for simple payment applications. Alas, Simple Payments is pretty poorly supported. If only there was a unified payment API or something...

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