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Add the light-surface counterpart to the white wordmark: a flat black rounded-rect badge with the goblin mark (reused wallet head geometry) next to the "Pay" wordmark. Does the job the black Apple Pay badge does at checkout: a compact, instantly recognisable payment-method mark. - static/goblinpay-badge-black.svg: self-contained inline SVG, no external font (mark reuses goblin-mark-white geometry; "Pay" uses the same system font stack as the existing wordmark). - gp-server: serve it at /static/goblinpay-badge-black.svg. - WooCommerce: wire the badge into the checkout payment-method row for both the classic gateway (get_icon override) and the Blocks checkout (data-URI icon in the method label). - BADGE-INTEGRATION.md: note for applying the badge to the hosted pay page after the grin1 rail work merges (pay.html left untouched to avoid conflict). The existing white wordmark stays for dark surfaces; this only adds the black-badge variant.