Similarly to the Paypal payment method type, we should define a "Venmo" payment method type so that each module needing Venmo doesn't have to define its own payment method type.
The first use case for it would be Braintree, there's a patch submitted to the Braintree issue queue that defines the payment method type (See #2979506: Commerce Braintree should support venmo → ).
We need 2 fields ("venmo_username", and "venmo_device_data") since the device data needs to be passed alongside the request for creating the payment method.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Patch applied and installed on site without issues.
I kind of forgot about this change... Lately, what we've been doing for example in Stripe is each gateway provides its own payment method type plugins... So will likely mark this as "won't fix".