For easy reference:
This is the motor: https://www.omc-stepperonline.com/download/17HS19-2004S1.pdf
This is the TMC2209:
https://www.aliexpress.us/item/3256804848449274.html?gatewayAdapt=glo2usa4itemAdapt
This is the ESP32: https://www.amazon.com/gp/product/B08D5ZD528/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I am using a 12v, 3A power supply.
It is wired as such - except RX and TX are connected (not just dotted lines) and there is a 1k resistor across them.
The current adjustment resistor reads 1.54v.
I'm not sure how to price the rate yet - I will take a closer look at the forum this afternoon and modify my top post accordingly.