Hi Myrat,
We currently don't offer an API to create, update or delete documents. We have previously discussed this here:
At the minute we only have a Custom Types API and integration fields. 'Integration fields' is in fact for integrating Product Catalogues from a 3rd party service like Shopify for your content creators to add to a document within Prismic.
We are evaluating each use case as they come so that we can provide the best solution for each one.
Thanks,
Phil.