Is there a Shopify Headless theme code plugin or app API

Payments + Shipping & Fulfilment
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1

I have a Shopify headless theme and I want to add a shopify code form. Is there a plugin for this or how can I do it?

Thank you in advance for your help.

2

Thank you, I want to add COD (Cash On Delivery) to the headless theme but no COD plugin allows this. How can I solve this problem?

3

Kennedy_web

I will choose the second method, but can you explain in more detail how to do it?