Each species/culture tends to maintain a particular view in regard to the application process, you can find similarities between two governments' approaches on distant planets if they share bio-cultural roots. Below are common security practices for each species as well as common loopholes to slip through them. This does not reflect the travel restrictions and security measures surrounding black sites, military bases, scum hives, etc.
Loopholes: Simply knowing another person's account information and avoiding Datastream usage afterward. Biohacking will be necessary to infiltrate higher security installations, in order to imitate a specific individual's spoor, retina, and bio-signatures.
Loopholes: Less advanced Legion governments often implant the RFID card under the skin & tie travel authorization to that ID, so you could steal it. Monolithic hierarchies, like the Legion's, often fall prey to social engineered co-opting of key functionaries, aka a honey-pot.
Nephilim society without Xion closely resembles a food chain; the weak are meat and the strong must eat. Uninterested in actively courting tourism and its knock-on effects, already assured of their own dominance, planetbound travelers pay a reciprocity fee before exiting orbit. The fee charged is based on what Nephilim pay when traveling to their respective homeworlds. Entering a veritable jungle, continued survival dirtside is on the visitor. As the Nephilim don't particularly screen visitors, many Nephilim worlds are havens for foreign criminals and their syndicates.
Loopholes: If you're too impatient to wait for a visa you can always hire a coyote, a border runner, to take you across. Traversing the Darkways leading to a Hub is risky, but possible.
All of this is meant to bring forward species' Prejudices without escalating inter-PC agitation, also to differentiate between the Wild Night and "Civilized Space."