The bank is the actual issuer of the card and, in turn, it determines the various rates and fees, as well as some of the benefits. (rewardexpert.com)
Say you have two credit cards, Card A and Card B and you make the minimum payments on both but you miss a couple or you are late on Card A. Now, even if the interest rate on Card A stays unchanged, the card issuer of Card B gets this information on lates from your credit file and can use increase your rate on Card B. (videocreditscore.com)
Unfortunately the options for «instant approval» credit cards are very limited, as the vast majority of issuers of cards for good credit, fair credit, and poor credit offer quick (but not instant) approval. (cardrates.com)