It's pretty fast and is week 2 already; I have some delay this round because of lots of meetings and work, besides that I facing some challenges with the original tools I was going to use. I was thinking to use Twist to handle the project initially but give up after playing with it for the integration.

I use Paperform + Zapier + Trello to work out a Selling Productize Service workflow.

Paperform: Online Form Builder And Form Creator
More than a form builder. Easily create beautiful forms, payment or product pages that feel truly yours.
Zapier | The easiest way to automate your work
Connect the apps you use everyday to automate your work and be more productive. 1,500+ apps and easy integrations - get started in minutes.
Trello
Infinitely flexible. Incredibly easy to use. Great mobile apps. It’s free. Trello keeps track of everything, from the big picture to the minute details.

How does it work? I'm using Paperform to build up a form to capture user requirement and handle payment; you can give it a try here, use the typical stripe payment 4242 4242 4242 to test the complete payment workflow.

Once the payment and requirement have submitted, it sends over to Zapier. Paperform does have some direct integration with Trello but is pretty basic. What I want something more detail, I enable the custom field power-up on my trello board, and I use Zapier to insert data correctly into all these custom fields. You can see that for each card; I have the project name as card title, the project detail in the card description, the plans that user subscribes to and the tools they prefer are all inserted into the custom fields.

Give it a try and feedback are welcome.

The form https://nocodeweekly.paperform.co

The board https://trello.com/b/1AOqYRYe/paperform