How can I change the text sizes for the "logoText" and "headerFields" in the pass.json? My issue is at the moment that the logo text is writing over the header field and it needs to be that length. Any suggestions?
You can’t.
Design (except some colors…) considerations are completely subject to Apple’s contemporary iOS style – and thus may change quite frequently with any OS update.
The logo (incl. text), if I remember that correctly, may take up to 160px@72ppi at the moment (won’t fit onto the watch otherwise…), so you’ll either need to get shorter or move some of the header fields elsewhere.
Note: Whenever you exceed Secondary or Aux-Fields however, the text will automatically be reduced in size to be squeezed in. If behaviour here is unexpected, check if the field sequence inside your JSON ist the same as it appears on the pass.
