In Jainism there is no scriptural endorsement of hanging or using nimbu-mirchi (lemon and chili) outside a shop as a talisman. That practice is not part of the Jain liturgical or philosophical tradition.

If you are looking for Jain-friendly ways to bless or protect a shop opening, you can consider alternatives that align with Jain principles:

• Keep the shop clean and well-organized, which reflects order and non-violence in daily conduct.
• Light a small lamp or diya and offer a moment of quiet reflection or prayer, inviting positive intentions.
• Recite or reflect on the Namokar Mantra or other basic Jain prayers for auspicious beginnings, focusing on non-violence, truth, and compassion.
• Display a simple Jain symbol or an image of a Tirthankara as a reminder of moral conduct and peaceful conduct in business.
• Encourage ethical sale practices, truthful advertising, and fair treatment of customers and workers, which attracts positive merit in Jain thought.

If you’d like, tell me which Jain tradition you follow (Digambar or Śvetāmbara) and I can share more tradition-specific guidance consistent with Jain dharma.