Form and panel structure:
------------------------------------------------------------
Line 26: FORM OPEN
Line 27: @csrf
Line 30: PANEL OPEN: general
Line 34: app_name field
Line 45: PANEL OPEN: tax-alerts
Line 58: PANEL OPEN: receipt
Line 68: PANEL OPEN: invoice
Line 86: PANEL OPEN: auto-notifications
Line 110: PANEL OPEN: company
Line 145: PANEL OPEN: email
Line 172: PANEL OPEN: appearance
Line 189: ui_theme field
Line 203: PANEL OPEN: customer-portal
Line 242: PANEL OPEN: sms-gateway
Line 303: PANEL OPEN: payment-gateway
Line 439: PANEL OPEN: payment-methods
Line 487: SUBMIT BUTTON
Line 489: FORM CLOSE
Line 500: FORM OPEN
Line 500: @csrf
Line 509: SUBMIT BUTTON
Line 511: FORM CLOSE
Line 522: FORM OPEN
Line 522: @csrf
Line 530: SUBMIT BUTTON
Line 532: FORM CLOSE
Line 543: FORM OPEN
Line 543: @csrf
Line 553: SUBMIT BUTTON
Line 555: FORM CLOSE
Line 566: FORM OPEN
Line 566: @csrf
Line 575: SUBMIT BUTTON
Line 577: FORM CLOSE
Line 747: ui_theme field
Line 759: ui_theme field