Currently, we do not have plans for an eGHL payment method, we have only received 2 requests for this payment method so far (this thread and the one you linked to).
As noted in the previous thread it is possible to create your own payment method if you are a developer yourself, or hire someone to develop the payment method for you. For that we have some documentation on how our payment methods work here:
The support post ‘eGHL Payment gateway’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.