Clue 1
The code used here is a spin on an old classic.
Clue 2
Normally, seeing isn't believing.
Solution
When all red and yellow letters are translated from Braille around the border, the plaintext reads: "I was not always a dishonest man after i lost my job at the plant i did not see another way. The fire was a fake and I knew my family would be away. I had a week before my life insurance ended. This was the way to provide for them."
Clue 3
The code is braille, but there's more to it than that.
Clue 4
The stamps may help you filter your information.
Clue 5
One color should be ignored. The other two (?) should not.
Clue 6
Yellow and blue will give you two letters per space. Green is where they overlap.
Clue 1
Consider the theme of the card.
Clue 2
La Sagrada Familia is known for its stained glass...
Solution
Holding the card up to a bright light, certain letters from the front are framed in the squares on the back. This plaintext reads: "My name is Antony Araslav."
Clue 3
You'll need excellent, bright light to solve this puzzle.
Clue 4
Sometimes, the answer isn't as opaque as it seems.
Clue 1
The theme (and principles) of this card come into play here, as well.
Clue 2
Orange is where red and yellow overlap.
Solution
Reading every other letter forwards, the plaintext is: "This part is merely a small diversion."
Clue 3
So the entire message is mixed except the first and last letters.
Clue 4
There are two sentences here, both running in different directions.