soon it will be on github

btcpay.py

@blueprint.route('/admin/pair', methods=['GET', 'POST'])
@roles_accepted('admin')
def btcpaypair():
    """Payment processor pairing."""
    btcpaypem_location = current_app.config.get('APP_DIR')+'/data/btcpayserver.key'
    btcpaytoken_location = current_app.config.get('APP_DIR')+'/data/btcpayserver.token'
    # Recognise if pairing is done and valid
    try:
        btcpayuri = current_app.config.get('BTCPAY_URI')
        btcpaycode = current_app.config.get('BTCPAY_CODE')
        fiat = current_app.config.get('FIAT')

        with open(btcpaypem_location, 'r') as file:
            btcpaypem = file.read()
        with open(btcpaytoken_location, 'r') as file:
            s = file.read()
            btcpaytoken = ast.literal_eval(s)

        btcpayclient = btcpay.BTCPayClient(
            host=btcpayuri,
            pem=btcpaypem,
            tokens=btcpaytoken,
        )
        # try if it works
        rates = btcpayclient.get_rates()
        log.debug(pprint.pformat(rates, depth=5))
        state = True
        log.debug("We found a working processor.")
    except Exception as e:
        log.debug(e)
        log.debug("We are unable to bind to the processor.")
        state = False

    # Form to update/pair
    form = AddPairingTextForm()
    if request.method == 'POST':
        if form.validate_on_submit():
            try:
                pem = btcpay.crypto.generate_privkey()
                fo = open(btcpaypem_location, "w")
                fo.write(pem)
                fo.close()
                btcpayclient = btcpay.BTCPayClient(
                    host=btcpayuri,
                    pem=pem
                )
                btcpaytoken = btcpayclient.pair_client(
                    form.pairing_code.data
                )
                fo = open(btcpaytoken_location, "w")
                fo.write(str(btcpaytoken))
                fo.close()
                flash('Your payment processor was paired successfully.', 'success')
                state = True
            except Exception as e:
                log.debug("Exception")
                log.exception(e)
                flash('The pairing process failed. Check logs or repeat.', 'error')
                state = False
        else:
            flash_errors(form)

    return render_template(
        'users/pair.html',
        state=state,
        form=form
    )