Service performed in Brazil for customer in Spain, paid in US

I am a resident of Brazil and recently did a job for a Spanish customer who paid me in the US.
I would like to know if I should pay tax on this job, and how I should do that. I do not have a social security number or anything in the US, as I am a non-resident.
Any ideas on that?

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Can a Pawn that performed an En Passant capture gain promotion when it advances to the 8th rank?

So lets say I capture En Passant with a pawn, using that same pawn I get to the 8th rank. Can I promote that pawn into anything else? I’ve heard of this restriction in various ways. Some say it can become a rook at best, some say it just stays a pawn, but moves backwards.

Please let me know if this is a classic case of “I’m losing better make some stuff up.” Or an actual rule.

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Can a Pawn that performed an En Passant capture gain promotion when it advances to the 8th column?

So lets say I En Passant capture with a pawn, using that same pawn I get to my opponents side of the field. Can I turn that pawn into anything else? I’ve heard of this restriction in various ways. Some say it can become a rook at best, some say it just stays a pawn, but walks backwords.

Please let me know if this is a classic case of “I’m losing better make some stuff up.” Or an actual rule.

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What tests can be performed on mobile apps to determine if they are secure?

My company is looking to work with a potential client’s backend provider in order to make an app for them. To do this, we need to use their API. We’ve spoken to this company and they are worried about security and so have said that they will only let us launch the app if we have it penetration tested by a third party.

The app will allow users to login and access their financial information so it makes sense that they want to make sure everything is secure but, from my understanding, “penetration testing” doesn’t really make sense for a mobile app. Is this correct? What can we do to satisfy them that the app is secure? Is there a name for a kind of standard app security test that could be performed by a third party?

Any idea of price for something like this would be greatly appreciated also.

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write a scipt to check if certains operations is being performed on a file [on hold]

i would like to know of a script that checks whether a operations is being performed on a file or directory.

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What is this skill move performed by Neymar called?

In the following video, Neymar does a double step-over from a dead stop by adding a touch, finishing with a body feint. What is this skill move called?

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I have performed an FFT and would like to filter the results to produce a ‘points per octave’ result

Where I am at the moment I can perform realtime FFTs, however the size is too great for me to plot in realtime, I need to try and filter extraneous data when I plot it.

I have come to the conclusion Points Per Octave is the best way to display this to try and retain detail in the low end of the frequency spectrum.

My question is, how do I go about doing this. Is the octave divided up linearly or logarithmically? And also, there is little chance of my data point falling exactly on this division, so how do I go about handling this?

Sorry to be so vague, but I actually could not find anything specifically to do with this to read up on, so I am guessing quite a lot here.

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Do any scriptures mention which yoga asanas should be performed everyday?

Do Patanjali’s yoga aphorisms or any other scriptures mention anything about which yoga asanas we should practice everyday?

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Why Avani Avittam (Upakarma) festival is performed? What’s its history?

What’s the history of Avani Avittam (Upakarma) festival? What does our scriptures say about it?

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Why Avani Avittam festival is performed? What’s its history?

What’s the history of Avani Avittam festival? What does our scriptures say about it?

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