Terminology:
Merchant Invoice: a bill expected to be fulfilled by a customer using any supported by the merchant crypto coin.
Merchant supported coins: Merchant might favor certain blockchain or coins over other for variety of reasons, regulations, stability, confirmation speed, exchange fees etc...
Creating an invoice:
To create an invoice, you need to perform a PUT HTTPS request against your project's unique URL with the following JSON format:
You will need an API KEY to authorize this request. It can be obtained from your project settings page.
Exact example can be found in your project->docs section.
The above creates a pending invoice in our system.
Response (JSON):
Starting from this point, your customer is expected to open the above payment URL and make the payment.