What are the difference between beliefern and liefern? I know that both mean to deliver but are they interchangeable?
Paradise Pink Fitness Ox Unisex Pink 637 Converse Pink Shoes One Adults' Star Suede Lifestyle Geranium xqvwngZPwf
"liefern" requires info on what is being delivered, optionally to whom it gets delivered to.
"beliefern" is the other way round. You must define who gets it, but it's optional to state what gets delivered.
Note Hans Peter's examples and add the example
Converse Unisex One Suede Geranium Paradise Ox 637 Shoes Pink Adults' Star Fitness Pink Pink Lifestyle Wir liefern Tomaten.
for clarity of the usage.
beliefern is the transitive version of liefern. The former automatically asks for an (accusative) object. It's like the difference between antworten und beantworten:
antworten auf die Frage = die Frage beantworten