post https://api.hel.io/v1/webhook/paylink/api-key
Create a global or pay link webhook using this endpoint. To create a global webhook, don't include the paylinkId.
NOTE: When using Helio on mainnet, set your Base URL to https://api.hel.io and generate your API keys from app.hel.io . For testnet, use https://api.dev.hel.io and generate your API keys from app.dev.hel.io.